25172989920 has 384 divisors, whose sum is σ = 95881726080. Its totient is φ = 6131220480.

The previous prime is 25172989903. The next prime is 25172989931. The reversal of 25172989920 is 2998927152.

25172989920 is a `hidden beast` number, since 2 + 517 + 29 + 89 + 9 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 5445210 + ... + 5449830.

It is an arithmetic number, because the mean of its divisors is an integer number (249691995).

Almost surely, 2^25172989920 is an apocalyptic number.

25172989920 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 25172989920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47940863040).

25172989920 is an abundant number, since it is smaller than the sum of its proper divisors (70708736160).

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

25172989920 is a wasteful number, since it uses less digits than its factorization.

25172989920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4755 (or 4741 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 54.

The spelling of 25172989920 in words is "twenty-five billion, one hundred seventy-two million, nine hundred eighty-nine thousand, nine hundred twenty".