642335257086 has 32 divisors (see below), whose sum is σ = 1356900128640. Its totient is φ = 202150406304.

The previous prime is 642335257073. The next prime is 642335257087. The reversal of 642335257086 is 680752533246.

It is a super-2 number, since 2×642335257086² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642335257087) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9581820 + ... + 9648623.

It is an arithmetic number, because the mean of its divisors is an integer number (42403129020).

Almost surely, 2^642335257086 is an apocalyptic number.

642335257086 is an abundant number, since it is smaller than the sum of its proper divisors (714564871554).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642335257086 is a wasteful number, since it uses less digits than its factorization.

642335257086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19230760.

The product of its (nonzero) digits is 7257600, while the sum is 51.

The spelling of 642335257086 in words is "six hundred forty-two billion, three hundred thirty-five million, two hundred fifty-seven thousand, eighty-six".