666904370 has 32 divisors (see below), whose sum is σ = 1378486080. Its totient is φ = 229746240.

The previous prime is 666904367. The next prime is 666904409. The reversal of 666904370 is 73409666.

It is a happy number.

It is a super-2 number, since 2×666904370² = 889522877450193800, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157457 + ... + 161636.

It is an arithmetic number, because the mean of its divisors is an integer number (43077690).

Almost surely, 2^666904370 is an apocalyptic number.

666904370 is an abundant number, since it is smaller than the sum of its proper divisors (711581710).

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

666904370 is a wasteful number, since it uses less digits than its factorization.

666904370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319130.

The product of its (nonzero) digits is 163296, while the sum is 41.

The square root of 666904370 is about 25824.4916697309. The cubic root of 666904370 is about 873.6842788930.

The spelling of 666904370 in words is "six hundred sixty-six million, nine hundred four thousand, three hundred seventy".