12155522451 has 4 divisors (see below), whose sum is σ = 16207363272. Its totient is φ = 8103681632.

The previous prime is 12155522419. The next prime is 12155522453. The reversal of 12155522451 is 15422555121.

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 12155522451 - 2⁵ = 12155522419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12155522453) 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, 2025920406 + ... + 2025920411.

It is an arithmetic number, because the mean of its divisors is an integer number (4051840818).

Almost surely, 2^12155522451 is an apocalyptic number.

12155522451 is a deficient number, since it is larger than the sum of its proper divisors (4051840821).

12155522451 is an equidigital number, since it uses as much as digits as its factorization.

12155522451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4051840820.

The product of its digits is 20000, while the sum is 33.

The spelling of 12155522451 in words is "twelve billion, one hundred fifty-five million, five hundred twenty-two thousand, four hundred fifty-one".