12665110644 has 48 divisors (see below), whose sum is σ = 32857184640. Its totient is φ = 4218912000.

The previous prime is 12665110643. The next prime is 12665110669. The reversal of 12665110644 is 44601156621.

12665110644 is a `hidden beast` number, since 1 + 2 + 6 + 6 + 5 + 1 + 1 + 0 + 644 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 12665110599 and 12665110608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12665110643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128644 + ... + 204644.

It is an arithmetic number, because the mean of its divisors is an integer number (684524680).

Almost surely, 2^12665110644 is an apocalyptic number.

It is an amenable number.

12665110644 is an abundant number, since it is smaller than the sum of its proper divisors (20192073996).

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

12665110644 is a wasteful number, since it uses less digits than its factorization.

12665110644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77557 (or 77549 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 12665110644 in words is "twelve billion, six hundred sixty-five million, one hundred ten thousand, six hundred forty-four".