12642661644780 has 96 divisors (see below), whose sum is σ = 36621036748800. Its totient is φ = 3255040891648.

The previous prime is 12642661644733. The next prime is 12642661644829. The reversal of 12642661644780 is 8744616624621.

It is a self number, because there is not a number n which added to its sum of digits gives 12642661644780.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 104128789 + ... + 104250131.

It is an arithmetic number, because the mean of its divisors is an integer number (381469132800).

Almost surely, 2^{12642661644780} is an apocalyptic number.

12642661644780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12642661644780 is an abundant number, since it is smaller than the sum of its proper divisors (23978375104020).

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

12642661644780 is a wasteful number, since it uses less digits than its factorization.

12642661644780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181263 (or 181261 counting only the distinct ones).

The product of its (nonzero) digits is 18579456, while the sum is 57.

The spelling of 12642661644780 in words is "twelve trillion, six hundred forty-two billion, six hundred sixty-one million, six hundred forty-four thousand, seven hundred eighty".