25403843664 has 60 divisors (see below), whose sum is σ = 72608168256. Its totient is φ = 8287776576.

The previous prime is 25403843659. The next prime is 25403843681. The reversal of 25403843664 is 46634830452.

25403843664 is a `hidden beast` number, since 2 + 540 + 3 + 8 + 43 + 6 + 64 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1869994 + ... + 1883529.

Almost surely, 2^25403843664 is an apocalyptic number.

25403843664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

25403843664 is an abundant number, since it is smaller than the sum of its proper divisors (47204324592).

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

25403843664 is a wasteful number, since it uses less digits than its factorization.

25403843664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3753584 (or 3753575 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 45.

The spelling of 25403843664 in words is "twenty-five billion, four hundred three million, eight hundred forty-three thousand, six hundred sixty-four".