666625422 has 16 divisors (see below), whose sum is σ = 1391218560. Its totient is φ = 212547192.

The previous prime is 666625409. The next prime is 666625439. The reversal of 666625422 is 224526666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2415172 + ... + 2415447.

It is an arithmetic number, because the mean of its divisors is an integer number (86951160).

Almost surely, 2^666625422 is an apocalyptic number.

666625422 is an abundant number, since it is smaller than the sum of its proper divisors (724593138).

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

666625422 is a wasteful number, since it uses less digits than its factorization.

666625422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4830647.

The product of its digits is 207360, while the sum is 39.

The square root of 666625422 is about 25819.0902628268. The cubic root of 666625422 is about 873.5624490972.

The spelling of 666625422 in words is "six hundred sixty-six million, six hundred twenty-five thousand, four hundred twenty-two".