670515888433021 has 4 divisors (see below), whose sum is σ = 674786690270332. Its totient is φ = 666245086595712.

The previous prime is 670515888433019. The next prime is 670515888433037. The reversal of 670515888433021 is 120334888515076.

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 514625331476025 + 155890556956996 = 22685355^2 + 12485614^2 .

It is a cyclic number.

It is not a de Polignac number, because 670515888433021 - 2¹ = 670515888433019 is a prime.

It is a super-2 number, since 2×670515888433021² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670515888433091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2135400918420 + ... + 2135400918733.

It is an arithmetic number, because the mean of its divisors is an integer number (168696672567583).

Almost surely, 2^{670515888433021} is an apocalyptic number.

It is an amenable number.

670515888433021 is a deficient number, since it is larger than the sum of its proper divisors (4270801837311).

670515888433021 is a wasteful number, since it uses less digits than its factorization.

670515888433021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4270801837310.

The product of its (nonzero) digits is 38707200, while the sum is 61.

The spelling of 670515888433021 in words is "six hundred seventy trillion, five hundred fifteen billion, eight hundred eighty-eight million, four hundred thirty-three thousand, twenty-one".