665610670 has 16 divisors (see below), whose sum is σ = 1203074928. Its totient is φ = 265138560.

The previous prime is 665610661. The next prime is 665610709. The reversal of 665610670 is 76016566.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135684 + ... + 140503.

It is an arithmetic number, because the mean of its divisors is an integer number (75192183).

Almost surely, 2^665610670 is an apocalyptic number.

665610670 is a deficient number, since it is larger than the sum of its proper divisors (537464258).

665610670 is a wasteful number, since it uses less digits than its factorization.

665610670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276435.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 665610670 is about 25799.4315828857. The cubic root of 665610670 is about 873.1189719536.

The spelling of 665610670 in words is "six hundred sixty-five million, six hundred ten thousand, six hundred seventy".