12055643551 has 32 divisors (see below), whose sum is σ = 14685121152. Its totient is φ = 9661317120.

The previous prime is 12055643539. The next prime is 12055643681. The reversal of 12055643551 is 15534655021.

It is a happy number.

It is not a de Polignac number, because 12055643551 - 2²⁵ = 12022089119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12055643551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12055613551) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20893375 + ... + 20893951.

It is an arithmetic number, because the mean of its divisors is an integer number (458910036).

Almost surely, 2^12055643551 is an apocalyptic number.

12055643551 is a deficient number, since it is larger than the sum of its proper divisors (2629477601).

12055643551 is a wasteful number, since it uses less digits than its factorization.

12055643551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1459.

The product of its (nonzero) digits is 90000, while the sum is 37.

The spelling of 12055643551 in words is "twelve billion, fifty-five million, six hundred forty-three thousand, five hundred fifty-one".