25551815227 has 2 divisors, whose sum is σ = 25551815228. Its totient is φ = 25551815226.

The previous prime is 25551815153. The next prime is 25551815231. The reversal of 25551815227 is 72251815552.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25551815227 is a prime.

It is a super-2 number, since 2×25551815227² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25551815297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12775907613 + 12775907614.

It is an arithmetic number, because the mean of its divisors is an integer number (12775907614).

Almost surely, 2^25551815227 is an apocalyptic number.

25551815227 is a deficient number, since it is larger than the sum of its proper divisors (1).

25551815227 is an equidigital number, since it uses as much as digits as its factorization.

25551815227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 280000, while the sum is 43.

The spelling of 25551815227 in words is "twenty-five billion, five hundred fifty-one million, eight hundred fifteen thousand, two hundred twenty-seven".