12561057037 has 4 divisors (see below), whose sum is σ = 12631230720. Its totient is φ = 12490883356.

The previous prime is 12561057011. The next prime is 12561057049. The reversal of 12561057037 is 73075016521.

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 12561057037 - 2¹⁵ = 12561024269 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12561056987 and 12561057005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12561057007) 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, 35086573 + ... + 35086930.

It is an arithmetic number, because the mean of its divisors is an integer number (3157807680).

Almost surely, 2^12561057037 is an apocalyptic number.

It is an amenable number.

12561057037 is a deficient number, since it is larger than the sum of its proper divisors (70173683).

12561057037 is an equidigital number, since it uses as much as digits as its factorization.

12561057037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70173682.

The product of its (nonzero) digits is 44100, while the sum is 37.

The spelling of 12561057037 in words is "twelve billion, five hundred sixty-one million, fifty-seven thousand, thirty-seven".