12515026706561 has 4 divisors (see below), whose sum is σ = 12515132079552. Its totient is φ = 12514921333572.

The previous prime is 12515026706519. The next prime is 12515026706563. The reversal of 12515026706561 is 16560762051521.

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 12515026706561 - 2²² = 12515022512257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12515026706563) 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, 52508141 + ... + 52745946.

It is an arithmetic number, because the mean of its divisors is an integer number (3128783019888).

Almost surely, 2^{12515026706561} is an apocalyptic number.

It is an amenable number.

12515026706561 is a deficient number, since it is larger than the sum of its proper divisors (105372991).

12515026706561 is a wasteful number, since it uses less digits than its factorization.

12515026706561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105372990.

The product of its (nonzero) digits is 756000, while the sum is 47.

The spelling of 12515026706561 in words is "twelve trillion, five hundred fifteen billion, twenty-six million, seven hundred six thousand, five hundred sixty-one".