25641604416 has 28 divisors (see below), whose sum is σ = 67843412192. Its totient is φ = 8547201408.

The previous prime is 25641604369. The next prime is 25641604477. The reversal of 25641604416 is 61440614652.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66774820 + ... + 66775203.

Almost surely, 2^25641604416 is an apocalyptic number.

It is an amenable number.

25641604416 is an abundant number, since it is smaller than the sum of its proper divisors (42201807776).

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

25641604416 is a wasteful number, since it uses less digits than its factorization.

25641604416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133550038 (or 133550028 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 39.

The spelling of 25641604416 in words is "twenty-five billion, six hundred forty-one million, six hundred four thousand, four hundred sixteen".