12566861877 has 16 divisors (see below), whose sum is σ = 18404559360. Its totient is φ = 7591879152.

The previous prime is 12566861837. The next prime is 12566861891. The reversal of 12566861877 is 77816866521.

It is a happy number.

It is not a de Polignac number, because 12566861877 - 2¹⁴ = 12566845493 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12566861837) 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, 4791543 + ... + 4794164.

It is an arithmetic number, because the mean of its divisors is an integer number (1150284960).

Almost surely, 2^12566861877 is an apocalyptic number.

It is an amenable number.

12566861877 is a deficient number, since it is larger than the sum of its proper divisors (5837697483).

12566861877 is a wasteful number, since it uses less digits than its factorization.

12566861877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9585752.

The product of its digits is 6773760, while the sum is 57.

The spelling of 12566861877 in words is "twelve billion, five hundred sixty-six million, eight hundred sixty-one thousand, eight hundred seventy-seven".