12642156644 has 96 divisors (see below), whose sum is σ = 25603331040. Its totient is φ = 5419008000.

The previous prime is 12642156629. The next prime is 12642156677. The reversal of 12642156644 is 44665124621.

It can be written as a sum of positive squares in 16 ways, for example, as 6742380544 + 5899776100 = 82112^2 + 76810^2 .

It is a super-2 number, since 2×12642156644² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4512044 + ... + 4514844.

It is an arithmetic number, because the mean of its divisors is an integer number (266701365).

Almost surely, 2^12642156644 is an apocalyptic number.

It is an amenable number.

12642156644 is an abundant number, since it is smaller than the sum of its proper divisors (12961174396).

12642156644 is a wasteful number, since it uses less digits than its factorization.

12642156644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2961 (or 2959 counting only the distinct ones).

The product of its digits is 276480, while the sum is 41.

The spelling of 12642156644 in words is "twelve billion, six hundred forty-two million, one hundred fifty-six thousand, six hundred forty-four".