12936978369 has 32 divisors (see below), whose sum is σ = 21917143040. Its totient is φ = 7388082576.

The previous prime is 12936978349. The next prime is 12936978391. The reversal of 12936978369 is 96387963921.

It is not a de Polignac number, because 12936978369 - 2⁸ = 12936978113 is a prime.

It is a super-2 number, since 2×12936978369² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12936978349) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 305784 + ... + 345510.

It is an arithmetic number, because the mean of its divisors is an integer number (684910720).

Almost surely, 2^12936978369 is an apocalyptic number.

It is an amenable number.

12936978369 is a deficient number, since it is larger than the sum of its proper divisors (8980164671).

12936978369 is a wasteful number, since it uses less digits than its factorization.

12936978369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41466 (or 41460 counting only the distinct ones).

The product of its digits is 26453952, while the sum is 63.

The spelling of 12936978369 in words is "twelve billion, nine hundred thirty-six million, nine hundred seventy-eight thousand, three hundred sixty-nine".