25000657920 has 528 divisors, whose sum is σ = 99784863360. Its totient is φ = 5669388288.

The previous prime is 25000657901. The next prime is 25000657933. The reversal of 25000657920 is 2975600052.

25000657920 is a `hidden beast` number, since 2 + 500 + 0 + 65 + 7 + 92 + 0 = 666.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 57738024 + ... + 57738456.

Almost surely, 2^25000657920 is an apocalyptic number.

25000657920 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 25000657920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49892431680).

25000657920 is an abundant number, since it is smaller than the sum of its proper divisors (74784205440).

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

25000657920 is a wasteful number, since it uses less digits than its factorization.

25000657920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650 (or 629 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The spelling of 25000657920 in words is "twenty-five billion, six hundred fifty-seven thousand, nine hundred twenty".