25521000051 has 24 divisors (see below), whose sum is σ = 36071763264. Its totient is φ = 16047365040.

The previous prime is 25520999993. The next prime is 25521000061. The reversal of 25521000051 is 15000012552.

It is not a de Polignac number, because 25521000051 - 2¹⁰ = 25520999027 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25520999991 and 25521000027.

It is not an unprimeable number, because it can be changed into a prime (25521000061) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 193936 + ... + 297746.

It is an arithmetic number, because the mean of its divisors is an integer number (1502990136).

Almost surely, 2^25521000051 is an apocalyptic number.

25521000051 is a deficient number, since it is larger than the sum of its proper divisors (10550763213).

25521000051 is a wasteful number, since it uses less digits than its factorization.

25521000051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104079 (or 104060 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 21.

The spelling of 25521000051 in words is "twenty-five billion, five hundred twenty-one million, fifty-one", and thus it is an aban number.