642734112660 has 96 divisors (see below), whose sum is σ = 1988366268672. Its totient is φ = 154300016640.

The previous prime is 642734112641. The next prime is 642734112661. The reversal of 642734112660 is 66211437246.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642734112661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13675051 + ... + 13721970.

It is an arithmetic number, because the mean of its divisors is an integer number (20712148632).

Almost surely, 2^642734112660 is an apocalyptic number.

642734112660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

642734112660 is an abundant number, since it is smaller than the sum of its proper divisors (1345632156012).

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

642734112660 is a wasteful number, since it uses less digits than its factorization.

642734112660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27397073 (or 27397071 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 42.

The spelling of 642734112660 in words is "six hundred forty-two billion, seven hundred thirty-four million, one hundred twelve thousand, six hundred sixty".