25215445155 has 16 divisors (see below), whose sum is σ = 40368499200. Its totient is φ = 13440308448.

The previous prime is 25215445127. The next prime is 25215445181. The reversal of 25215445155 is 55154451252.

It is a happy number.

It is not a de Polignac number, because 25215445155 - 2⁷ = 25215445027 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 469227 + ... + 520196.

It is an arithmetic number, because the mean of its divisors is an integer number (2523031200).

Almost surely, 2^25215445155 is an apocalyptic number.

25215445155 is a deficient number, since it is larger than the sum of its proper divisors (15153054045).

25215445155 is a wasteful number, since it uses less digits than its factorization.

25215445155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991130.

The product of its digits is 200000, while the sum is 39.

The spelling of 25215445155 in words is "twenty-five billion, two hundred fifteen million, four hundred forty-five thousand, one hundred fifty-five".