12644402554 has 16 divisors (see below), whose sum is σ = 21678249600. Its totient is φ = 5418496944.

The previous prime is 12644402531. The next prime is 12644402557. The reversal of 12644402554 is 45520444621.

It is not an unprimeable number, because it can be changed into a prime (12644402557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125532 + ... + 202600.

It is an arithmetic number, because the mean of its divisors is an integer number (1354890600).

Almost surely, 2^12644402554 is an apocalyptic number.

12644402554 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

12644402554 is a deficient number, since it is larger than the sum of its proper divisors (9033847046).

12644402554 is a wasteful number, since it uses less digits than its factorization.

12644402554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88797.

The product of its (nonzero) digits is 153600, while the sum is 37.

The spelling of 12644402554 in words is "twelve billion, six hundred forty-four million, four hundred two thousand, five hundred fifty-four".