25204515440 has 80 divisors (see below), whose sum is σ = 64813955808. Its totient is φ = 9054747648.

The previous prime is 25204515437. The next prime is 25204515487. The reversal of 25204515440 is 4451540252.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 25204515397 and 25204515406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 289022 + ... + 365981.

Almost surely, 2^25204515440 is an apocalyptic number.

25204515440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25204515440 is an abundant number, since it is smaller than the sum of its proper divisors (39609440368).

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

25204515440 is a wasteful number, since it uses less digits than its factorization.

25204515440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655066 (or 655060 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 32.

The spelling of 25204515440 in words is "twenty-five billion, two hundred four million, five hundred fifteen thousand, four hundred forty".