25518406725 has 48 divisors (see below), whose sum is σ = 53575162240. Its totient is φ = 11665555200.

The previous prime is 25518406723. The next prime is 25518406729. The reversal of 25518406725 is 52760481552.

25518406725 is a `hidden beast` number, since 25 + 518 + 40 + 6 + 72 + 5 = 666.

It is not a de Polignac number, because 25518406725 - 2¹ = 25518406723 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25518406723) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2695636 + ... + 2705085.

Almost surely, 2^25518406725 is an apocalyptic number.

25518406725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25518406725 is an abundant number, since it is smaller than the sum of its proper divisors (28056755515).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25518406725 is a wasteful number, since it uses less digits than its factorization.

25518406725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5400747 (or 5400736 counting only the distinct ones).

The product of its (nonzero) digits is 672000, while the sum is 45.

The spelling of 25518406725 in words is "twenty-five billion, five hundred eighteen million, four hundred six thousand, seven hundred twenty-five".