12561030511 has 16 divisors (see below), whose sum is σ = 13407085440. Its totient is φ = 11734022880.

The previous prime is 12561030487. The next prime is 12561030529. The reversal of 12561030511 is 11503016521.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12561030511 - 2⁵ = 12561030479 is a prime.

It is a super-2 number, since 2×12561030511² (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 (12561030551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 845796 + ... + 860518.

It is an arithmetic number, because the mean of its divisors is an integer number (837942840).

Almost surely, 2^12561030511 is an apocalyptic number.

12561030511 is a deficient number, since it is larger than the sum of its proper divisors (846054929).

12561030511 is a wasteful number, since it uses less digits than its factorization.

12561030511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15366.

The product of its (nonzero) digits is 900, while the sum is 25.

The spelling of 12561030511 in words is "twelve billion, five hundred sixty-one million, thirty thousand, five hundred eleven".