12766638195 has 24 divisors (see below), whose sum is σ = 22214964096. Its totient is φ = 6782373888.

The previous prime is 12766638191. The next prime is 12766638217. The reversal of 12766638195 is 59183666721.

It is not a de Polignac number, because 12766638195 - 2² = 12766638191 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12766638191) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 540387 + ... + 563516.

It is an arithmetic number, because the mean of its divisors is an integer number (925623504).

Almost surely, 2^12766638195 is an apocalyptic number.

12766638195 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12766638195 is a deficient number, since it is larger than the sum of its proper divisors (9448325901).

12766638195 is a wasteful number, since it uses less digits than its factorization.

12766638195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1104171 (or 1104168 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 54.

The spelling of 12766638195 in words is "twelve billion, seven hundred sixty-six million, six hundred thirty-eight thousand, one hundred ninety-five".