25510520061 has 24 divisors (see below), whose sum is σ = 39710606936. Its totient is φ = 15687872640.

The previous prime is 25510520053. The next prime is 25510520111. The reversal of 25510520061 is 16002501552.

25510520061 is a `hidden beast` number, since 2 + 551 + 0 + 52 + 0 + 0 + 61 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 11150092836 + 14360427225 = 105594^2 + 119835^2 .

It is not a de Polignac number, because 25510520061 - 2³ = 25510520053 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25510520011) 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, 94971 + ... + 245031.

Almost surely, 2^25510520061 is an apocalyptic number.

It is an amenable number.

25510520061 is a deficient number, since it is larger than the sum of its proper divisors (14200086875).

25510520061 is a wasteful number, since it uses less digits than its factorization.

25510520061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151533 (or 151530 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The spelling of 25510520061 in words is "twenty-five billion, five hundred ten million, five hundred twenty thousand, sixty-one".