642558925 has 12 divisors (see below), whose sum is σ = 797148756. Its totient is φ = 513804800.

The previous prime is 642558899. The next prime is 642558941. The reversal of 642558925 is 529855246.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 132296004 + 510262921 = 11502^2 + 22589^2 .

It is not a de Polignac number, because 642558925 - 2⁵ = 642558893 is a prime.

It is a Duffinian number.

It is a congruent 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, 63837 + ... + 73213.

It is an arithmetic number, because the mean of its divisors is an integer number (66429063).

Almost surely, 2^642558925 is an apocalyptic number.

It is an amenable number.

642558925 is a deficient number, since it is larger than the sum of its proper divisors (154589831).

642558925 is a wasteful number, since it uses less digits than its factorization.

642558925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12128 (or 12123 counting only the distinct ones).

The product of its digits is 864000, while the sum is 46.

The square root of 642558925 is about 25348.7460242119. The cubic root of 642558925 is about 862.9208979790.

The spelling of 642558925 in words is "six hundred forty-two million, five hundred fifty-eight thousand, nine hundred twenty-five".