25317606420 has 72 divisors (see below), whose sum is σ = 76811148960. Its totient is φ = 6750095040.

The previous prime is 25317606397. The next prime is 25317606427. The reversal of 25317606420 is 2460671352.

25317606420 is a `hidden beast` number, since 2 + 5 + 3 + 1 + 7 + 6 + 0 + 642 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25317606427) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1324491 + ... + 1343469.

Almost surely, 2^25317606420 is an apocalyptic number.

25317606420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25317606420 is an abundant number, since it is smaller than the sum of its proper divisors (51493542540).

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

25317606420 is a wasteful number, since it uses less digits than its factorization.

25317606420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26405 (or 26400 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The spelling of 25317606420 in words is "twenty-five billion, three hundred seventeen million, six hundred six thousand, four hundred twenty".