25015421155 has 16 divisors (see below), whose sum is σ = 30253503744. Its totient is φ = 19855825920.

The previous prime is 25015421107. The next prime is 25015421177. The reversal of 25015421155 is 55112451052.

It is not a de Polignac number, because 25015421155 - 2⁷ = 25015421027 is a prime.

It is a Duffinian number.

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, 1459435 + ... + 1476475.

It is an arithmetic number, because the mean of its divisors is an integer number (1890843984).

Almost surely, 2^25015421155 is an apocalyptic number.

25015421155 is a deficient number, since it is larger than the sum of its proper divisors (5238082589).

25015421155 is a wasteful number, since it uses less digits than its factorization.

25015421155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19326.

The product of its (nonzero) digits is 10000, while the sum is 31.

The spelling of 25015421155 in words is "twenty-five billion, fifteen million, four hundred twenty-one thousand, one hundred fifty-five".