25318379520 has 832 divisors, whose sum is σ = 106690068480. Its totient is φ = 5573836800.

The previous prime is 25318379503. The next prime is 25318379539. The reversal of 25318379520 is 2597381352.

25318379520 is a `hidden beast` number, since 2 + 53 + 1 + 8 + 3 + 79 + 520 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 119992215 + ... + 119992425.

Almost surely, 2^25318379520 is an apocalyptic number.

25318379520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25318379520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53345034240).

25318379520 is an abundant number, since it is smaller than the sum of its proper divisors (81371688960).

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

25318379520 is a wasteful number, since it uses less digits than its factorization.

25318379520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287 (or 259 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 45.

The spelling of 25318379520 in words is "twenty-five billion, three hundred eighteen million, three hundred seventy-nine thousand, five hundred twenty".