12554311551 has 4 divisors (see below), whose sum is σ = 16739082072. Its totient is φ = 8369541032.

The previous prime is 12554311489. The next prime is 12554311573. The reversal of 12554311551 is 15511345521.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12554311551 - 2²³ = 12545922943 is a prime.

It is a super-2 number, since 2×12554311551² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12554311591) 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, 2092385256 + ... + 2092385261.

It is an arithmetic number, because the mean of its divisors is an integer number (4184770518).

Almost surely, 2^12554311551 is an apocalyptic number.

12554311551 is a deficient number, since it is larger than the sum of its proper divisors (4184770521).

12554311551 is an equidigital number, since it uses as much as digits as its factorization.

12554311551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4184770520.

The product of its digits is 15000, while the sum is 33.

The spelling of 12554311551 in words is "twelve billion, five hundred fifty-four million, three hundred eleven thousand, five hundred fifty-one".