642634056460 has 36 divisors (see below), whose sum is σ = 1483369360704. Its totient is φ = 233685110560.

The previous prime is 642634056431. The next prime is 642634056461. The reversal of 642634056460 is 64650436246.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 642634056460.

It is not an unprimeable number, because it can be changed into a prime (642634056461) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 132773212 + ... + 132778051.

It is an arithmetic number, because the mean of its divisors is an integer number (41204704464).

Almost surely, 2^642634056460 is an apocalyptic number.

It is an amenable number.

642634056460 is an abundant number, since it is smaller than the sum of its proper divisors (840735304244).

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

642634056460 is a wasteful number, since it uses less digits than its factorization.

642634056460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265551294 (or 265551281 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 46.

The spelling of 642634056460 in words is "six hundred forty-two billion, six hundred thirty-four million, fifty-six thousand, four hundred sixty".