25431425775 has 72 divisors (see below), whose sum is σ = 52236344160. Its totient is φ = 11585905920.

The previous prime is 25431425741. The next prime is 25431425777. The reversal of 25431425775 is 57752413452.

25431425775 is a `hidden beast` number, since 2 + 5 + 4 + 31 + 42 + 577 + 5 = 666.

It is not a de Polignac number, because 25431425775 - 2⁷ = 25431425647 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 25431425775.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25431425777) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 433921 + ... + 489029.

It is an arithmetic number, because the mean of its divisors is an integer number (725504780).

Almost surely, 2^25431425775 is an apocalyptic number.

25431425775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

25431425775 is an abundant number, since it is smaller than the sum of its proper divisors (26804918385).

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

25431425775 is a wasteful number, since it uses less digits than its factorization.

25431425775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55425 (or 55417 counting only the distinct ones).

The product of its digits is 1176000, while the sum is 45.

The spelling of 25431425775 in words is "twenty-five billion, four hundred thirty-one million, four hundred twenty-five thousand, seven hundred seventy-five".