12897117261 has 12 divisors (see below), whose sum is σ = 21290479392. Its totient is φ = 7369781256.

The previous prime is 12897117239. The next prime is 12897117263. The reversal of 12897117261 is 16271179821.

It is a happy number.

It is not a de Polignac number, because 12897117261 - 2⁶ = 12897117197 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12897117263) 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, 102358011 + ... + 102358136.

It is an arithmetic number, because the mean of its divisors is an integer number (1774206616).

Almost surely, 2^12897117261 is an apocalyptic number.

It is an amenable number.

12897117261 is a deficient number, since it is larger than the sum of its proper divisors (8393362131).

12897117261 is a wasteful number, since it uses less digits than its factorization.

12897117261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204716160 (or 204716157 counting only the distinct ones).

The product of its digits is 84672, while the sum is 45.

The spelling of 12897117261 in words is "twelve billion, eight hundred ninety-seven million, one hundred seventeen thousand, two hundred sixty-one".