12564977751 has 12 divisors (see below), whose sum is σ = 18151413280. Its totient is φ = 8375728320.

The previous prime is 12564977731. The next prime is 12564977779. The reversal of 12564977751 is 15777946521.

12564977751 is a `hidden beast` number, since 1 + 2 + 564 + 9 + 7 + 7 + 75 + 1 = 666.

It is not a de Polignac number, because 12564977751 - 2¹³ = 12564969559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12564977731) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14991 + ... + 159231.

Almost surely, 2^12564977751 is an apocalyptic number.

12564977751 is a deficient number, since it is larger than the sum of its proper divisors (5586435529).

12564977751 is a wasteful number, since it uses less digits than its factorization.

12564977751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153926 (or 153923 counting only the distinct ones).

The product of its digits is 3704400, while the sum is 54.

The spelling of 12564977751 in words is "twelve billion, five hundred sixty-four million, nine hundred seventy-seven thousand, seven hundred fifty-one".