25020566640 has 120 divisors (see below), whose sum is σ = 86924972160. Its totient is φ = 6442071552.

The previous prime is 25020566587. The next prime is 25020566653. The reversal of 25020566640 is 4666502052.

It is a tau number, because it is divible by the number of its divisors (120).

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

It is a junction number, because it is equal to n+sod(n) for n = 25020566595 and 25020566604.

It is a congruent number.

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, 578272 + ... + 620031.

It is an arithmetic number, because the mean of its divisors is an integer number (724374768).

Almost surely, 2^25020566640 is an apocalyptic number.

25020566640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25020566640 is an abundant number, since it is smaller than the sum of its proper divisors (61904405520).

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

25020566640 is a wasteful number, since it uses less digits than its factorization.

25020566640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1198351 (or 1198342 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The spelling of 25020566640 in words is "twenty-five billion, twenty million, five hundred sixty-six thousand, six hundred forty".