665663910 has 16 divisors (see below), whose sum is σ = 1597593456. Its totient is φ = 177510368.

The previous prime is 665663891. The next prime is 665663923. The reversal of 665663910 is 19366566.

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, 11094369 + ... + 11094428.

It is an arithmetic number, because the mean of its divisors is an integer number (99849591).

Almost surely, 2^665663910 is an apocalyptic number.

665663910 is an abundant number, since it is smaller than the sum of its proper divisors (931929546).

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

665663910 is a wasteful number, since it uses less digits than its factorization.

665663910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22188807.

The product of its (nonzero) digits is 174960, while the sum is 42.

The square root of 665663910 is about 25800.4633679320. The cubic root of 665663910 is about 873.1422506343.

The spelling of 665663910 in words is "six hundred sixty-five million, six hundred sixty-three thousand, nine hundred ten".