25405652544 has 28 divisors (see below), whose sum is σ = 67219122864. Its totient is φ = 8468550784.

The previous prime is 25405652429. The next prime is 25405652561. The reversal of 25405652544 is 44525650452.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 25405652496 and 25405652505.

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, 66160362 + ... + 66160745.

Almost surely, 2^25405652544 is an apocalyptic number.

25405652544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

25405652544 is an abundant number, since it is smaller than the sum of its proper divisors (41813470320).

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

25405652544 is a wasteful number, since it uses less digits than its factorization.

25405652544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132321122 (or 132321112 counting only the distinct ones).

The product of its (nonzero) digits is 960000, while the sum is 42.

The spelling of 25405652544 in words is "twenty-five billion, four hundred five million, six hundred fifty-two thousand, five hundred forty-four".