12642156645 has 16 divisors (see below), whose sum is σ = 20230912512. Its totient is φ = 6741329600.

The previous prime is 12642156629. The next prime is 12642156677. The reversal of 12642156645 is 54665124621.

It is not a de Polignac number, because 12642156645 - 2⁴ = 12642156629 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12642156597 and 12642156606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22444 + ... + 160586.

It is an arithmetic number, because the mean of its divisors is an integer number (1264432032).

Almost surely, 2^12642156645 is an apocalyptic number.

12642156645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12642156645 is a deficient number, since it is larger than the sum of its proper divisors (7588755867).

12642156645 is a wasteful number, since it uses less digits than its factorization.

12642156645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144252.

The product of its digits is 345600, while the sum is 42.

The spelling of 12642156645 in words is "twelve billion, six hundred forty-two million, one hundred fifty-six thousand, six hundred forty-five".