666764425 has 24 divisors (see below), whose sum is σ = 836057600. Its totient is φ = 527472000.

The previous prime is 666764393. The next prime is 666764453. The reversal of 666764425 is 524467666.

It is not a de Polignac number, because 666764425 - 2⁵ = 666764393 is a prime.

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, 1109125 + ... + 1109725.

Almost surely, 2^666764425 is an apocalyptic number.

It is an amenable number.

666764425 is a deficient number, since it is larger than the sum of its proper divisors (169293175).

666764425 is a wasteful number, since it uses less digits than its factorization.

666764425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033 (or 1028 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 46.

The square root of 666764425 is about 25821.7819873068. The cubic root of 666764425 is about 873.6231625345.

The spelling of 666764425 in words is "six hundred sixty-six million, seven hundred sixty-four thousand, four hundred twenty-five".