12718665261 has 24 divisors (see below), whose sum is σ = 18566702336. Its totient is φ = 8389124640.

The previous prime is 12718665257. The next prime is 12718665263. The reversal of 12718665261 is 16256681721.

It is not a de Polignac number, because 12718665261 - 2² = 12718665257 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 (12718665263) 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, 1118796 + ... + 1130106.

Almost surely, 2^12718665261 is an apocalyptic number.

It is an amenable number.

12718665261 is a deficient number, since it is larger than the sum of its proper divisors (5848037075).

12718665261 is a wasteful number, since it uses less digits than its factorization.

12718665261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12633 (or 12630 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The spelling of 12718665261 in words is "twelve billion, seven hundred eighteen million, six hundred sixty-five thousand, two hundred sixty-one".