25664475 has 24 divisors (see below), whose sum is σ = 44930160. Its totient is φ = 12881920.

The previous prime is 25664453. The next prime is 25664477. The reversal of 25664475 is 57446652.

It is not a de Polignac number, because 25664475 - 2²⁴ = 8887259 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25664477) 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, 8790 + ... + 11339.

It is an arithmetic number, because the mean of its divisors is an integer number (1872090).

Almost surely, 2^25664475 is an apocalyptic number.

25664475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

25664475 is a deficient number, since it is larger than the sum of its proper divisors (19265685).

25664475 is a wasteful number, since it uses less digits than its factorization.

25664475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20159 (or 20154 counting only the distinct ones).

The product of its digits is 201600, while the sum is 39.

The square root of 25664475 is about 5066.0117449528. The cubic root of 25664475 is about 294.9697373916.

The spelling of 25664475 in words is "twenty-five million, six hundred sixty-four thousand, four hundred seventy-five".