12631253561 has 4 divisors (see below), whose sum is σ = 13296056400. Its totient is φ = 11966450724.

The previous prime is 12631253527. The next prime is 12631253563. The reversal of 12631253561 is 16535213621.

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 de Polignac number, because none of the positive numbers 2^k-12631253561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12631253563) 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, 332401391 + ... + 332401428.

It is an arithmetic number, because the mean of its divisors is an integer number (3324014100).

Almost surely, 2^12631253561 is an apocalyptic number.

It is an amenable number.

12631253561 is a deficient number, since it is larger than the sum of its proper divisors (664802839).

12631253561 is an equidigital number, since it uses as much as digits as its factorization.

12631253561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664802838.

The product of its digits is 32400, while the sum is 35.

The spelling of 12631253561 in words is "twelve billion, six hundred thirty-one million, two hundred fifty-three thousand, five hundred sixty-one".