12710637561 has 4 divisors (see below), whose sum is σ = 16947516752. Its totient is φ = 8473758372.

The previous prime is 12710637553. The next prime is 12710637593. The reversal of 12710637561 is 16573601721.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16573601721 = 3 ⋅5524533907.

It is not a de Polignac number, because 12710637561 - 2³ = 12710637553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12710630561) 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, 2118439591 + ... + 2118439596.

It is an arithmetic number, because the mean of its divisors is an integer number (4236879188).

Almost surely, 2^12710637561 is an apocalyptic number.

It is an amenable number.

12710637561 is a deficient number, since it is larger than the sum of its proper divisors (4236879191).

12710637561 is an equidigital number, since it uses as much as digits as its factorization.

12710637561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4236879190.

The product of its (nonzero) digits is 52920, while the sum is 39.

The spelling of 12710637561 in words is "twelve billion, seven hundred ten million, six hundred thirty-seven thousand, five hundred sixty-one".