12578399644 has 12 divisors (see below), whose sum is σ = 22016736000. Its totient is φ = 6287903648.

The previous prime is 12578399641. The next prime is 12578399663. The reversal of 12578399644 is 44699387521.

It is a super-2 number, since 2×12578399644² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12578399641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 302044 + ... + 341155.

It is an arithmetic number, because the mean of its divisors is an integer number (1834728000).

Almost surely, 2^12578399644 is an apocalyptic number.

It is an amenable number.

12578399644 is a deficient number, since it is larger than the sum of its proper divisors (9438336356).

12578399644 is a wasteful number, since it uses less digits than its factorization.

12578399644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648092 (or 648090 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 58.

The spelling of 12578399644 in words is "twelve billion, five hundred seventy-eight million, three hundred ninety-nine thousand, six hundred forty-four".