25681633400 has 48 divisors (see below), whose sum is σ = 61323593640. Its totient is φ = 9995011200.

The previous prime is 25681633391. The next prime is 25681633429. The reversal of 25681633400 is 433618652.

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, 1727846 + ... + 1742645.

Almost surely, 2^25681633400 is an apocalyptic number.

25681633400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25681633400 is an abundant number, since it is smaller than the sum of its proper divisors (35641960240).

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

25681633400 is a wasteful number, since it uses less digits than its factorization.

25681633400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3470544 (or 3470535 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 25681633400 in words is "twenty-five billion, six hundred eighty-one million, six hundred thirty-three thousand, four hundred".