25312017420 has 72 divisors (see below), whose sum is σ = 76866832224. Its totient is φ = 6742219008.

The previous prime is 25312017413. The next prime is 25312017449. The reversal of 25312017420 is 2471021352.

25312017420 is a `hidden beast` number, since 2 + 5 + 31 + 201 + 7 + 420 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 80392 + ... + 238928.

It is an arithmetic number, because the mean of its divisors is an integer number (1067594892).

Almost surely, 2^25312017420 is an apocalyptic number.

25312017420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25312017420 is an abundant number, since it is smaller than the sum of its proper divisors (51554814804).

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

25312017420 is a wasteful number, since it uses less digits than its factorization.

25312017420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159439 (or 159434 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

Adding to 25312017420 its reverse (2471021352), we get a palindrome (27783038772).

The spelling of 25312017420 in words is "twenty-five billion, three hundred twelve million, seventeen thousand, four hundred twenty".