25420641625 has 16 divisors (see below), whose sum is σ = 31908369168. Its totient is φ = 20218944000.

The previous prime is 25420641619. The next prime is 25420641629. The reversal of 25420641625 is 52614602452.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 8617223241 + 16803418384 = 92829^2 + 129628^2 .

It is not a de Polignac number, because 25420641625 - 2⁵ = 25420641593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25420641629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 566136 + ... + 609385.

It is an arithmetic number, because the mean of its divisors is an integer number (1994273073).

Almost surely, 2^25420641625 is an apocalyptic number.

25420641625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25420641625 is a deficient number, since it is larger than the sum of its proper divisors (6487727543).

25420641625 is a wasteful number, since it uses less digits than its factorization.

25420641625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1175709 (or 1175699 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 37.

The spelling of 25420641625 in words is "twenty-five billion, four hundred twenty million, six hundred forty-one thousand, six hundred twenty-five".