642925025 has 12 divisors (see below), whose sum is σ = 797544192. Its totient is φ = 514135440.

The previous prime is 642925001. The next prime is 642925037. The reversal of 642925025 is 520529246.

It is not a de Polignac number, because 642925025 - 2²⁶ = 575816161 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 108284 + ... + 114066.

It is an arithmetic number, because the mean of its divisors is an integer number (66462016).

Almost surely, 2^642925025 is an apocalyptic number.

It is an amenable number.

642925025 is a deficient number, since it is larger than the sum of its proper divisors (154619167).

642925025 is a wasteful number, since it uses less digits than its factorization.

642925025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10240 (or 10235 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 642925025 is about 25355.9662604287. The cubic root of 642925025 is about 863.0847508437.

The spelling of 642925025 in words is "six hundred forty-two million, nine hundred twenty-five thousand, twenty-five".