870615018835621 has 4 divisors (see below), whose sum is σ = 884887396193644. Its totient is φ = 856342641477600.

The previous prime is 870615018835613. The next prime is 870615018835633. The reversal of 870615018835621 is 126538810516078.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 400064562604996 + 470550456230625 = 20001614^2 + 21692175^2 .

It is a cyclic number.

It is not a de Polignac number, because 870615018835621 - 2³ = 870615018835613 is a prime.

It is a super-2 number, since 2×870615018835621² (a number of 31 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (61), and also a Moran number because the ratio is a prime number: 14272377357961 = 870615018835621 / (8 + 7 + 0 + 6 + 1 + 5 + 0 + 1 + 8 + 8 + 3 + 5 + 6 + 2 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 870615018835621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (870615018835721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7136188678920 + ... + 7136188679041.

It is an arithmetic number, because the mean of its divisors is an integer number (221221849048411).

Almost surely, 2^{870615018835621} is an apocalyptic number.

It is an amenable number.

870615018835621 is a deficient number, since it is larger than the sum of its proper divisors (14272377358023).

870615018835621 is a wasteful number, since it uses less digits than its factorization.

870615018835621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14272377358022.

The product of its (nonzero) digits is 19353600, while the sum is 61.

The spelling of 870615018835621 in words is "eight hundred seventy trillion, six hundred fifteen billion, eighteen million, eight hundred thirty-five thousand, six hundred twenty-one".