12511079551 has 4 divisors (see below), whose sum is σ = 12511303272. Its totient is φ = 12510855832.

The previous prime is 12511079543. The next prime is 12511079557. The reversal of 12511079551 is 15597011521.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12511079551 - 2³ = 12511079543 is a prime.

It is a super-2 number, since 2×12511079551² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12511079551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12511079557) 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, 54045 + ... + 167161.

It is an arithmetic number, because the mean of its divisors is an integer number (3127825818).

Almost surely, 2^12511079551 is an apocalyptic number.

12511079551 is a deficient number, since it is larger than the sum of its proper divisors (223721).

12511079551 is a wasteful number, since it uses less digits than its factorization.

12511079551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223720.

The product of its (nonzero) digits is 15750, while the sum is 37.

The spelling of 12511079551 in words is "twelve billion, five hundred eleven million, seventy-nine thousand, five hundred fifty-one".