642515110464 has 56 divisors (see below), whose sum is σ = 1700053321248. Its totient is φ = 214163461120.

The previous prime is 642515110451. The next prime is 642515110511. The reversal of 642515110464 is 464011515246.

It is a super-2 number, since 2×642515110464² (a number of 24 digits) contains 22 as substring.

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, 6886204 + ... + 6978884.

Almost surely, 2^642515110464 is an apocalyptic number.

642515110464 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

642515110464 is an abundant number, since it is smaller than the sum of its proper divisors (1057538210784).

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

642515110464 is a wasteful number, since it uses less digits than its factorization.

642515110464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128803 (or 128793 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 39.

It can be divided in two parts, 64251 and 5110464, that added together give a palindrome (5174715).

The spelling of 642515110464 in words is "six hundred forty-two billion, five hundred fifteen million, one hundred ten thousand, four hundred sixty-four".