870641437672865 has 8 divisors (see below), whose sum is σ = 1044786996489768. Its totient is φ = 696501635950080.

The previous prime is 870641437672777. The next prime is 870641437672987. The reversal of 870641437672865 is 568276734146078.

It can be written as a sum of positive squares in 4 ways, for example, as 109282854376336 + 761358583296529 = 10453844^2 + 27592727^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-870641437672865 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 870641437672792 and 870641437672801.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1438940816 + ... + 1439545745.

It is an arithmetic number, because the mean of its divisors is an integer number (130598374561221).

Almost surely, 2^{870641437672865} is an apocalyptic number.

It is an amenable number.

870641437672865 is a deficient number, since it is larger than the sum of its proper divisors (174145558816903).

870641437672865 is a wasteful number, since it uses less digits than its factorization.

870641437672865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2878547059.

The product of its (nonzero) digits is 2275983360, while the sum is 74.

The spelling of 870641437672865 in words is "eight hundred seventy trillion, six hundred forty-one billion, four hundred thirty-seven million, six hundred seventy-two thousand, eight hundred sixty-five".