12611656637 has 4 divisors (see below), whose sum is σ = 12613455360. Its totient is φ = 12609857916.

The previous prime is 12611656613. The next prime is 12611656643. The reversal of 12611656637 is 73665611621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12611656637 - 2⁶ = 12611656573 is a prime.

It is a super-2 number, since 2×12611656637² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12611656237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 888803 + ... + 902880.

It is an arithmetic number, because the mean of its divisors is an integer number (3153363840).

Almost surely, 2^12611656637 is an apocalyptic number.

It is an amenable number.

12611656637 is a deficient number, since it is larger than the sum of its proper divisors (1798723).

12611656637 is an equidigital number, since it uses as much as digits as its factorization.

12611656637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1798722.

The product of its digits is 272160, while the sum is 44.

The spelling of 12611656637 in words is "twelve billion, six hundred eleven million, six hundred fifty-six thousand, six hundred thirty-seven".