665712164 has 48 divisors (see below), whose sum is σ = 1276025856. Its totient is φ = 302054400.

The previous prime is 665712143. The next prime is 665712169. The reversal of 665712164 is 461217566.

It is not an unprimeable number, because it can be changed into a prime (665712169) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 963059 + ... + 963749.

It is an arithmetic number, because the mean of its divisors is an integer number (26583872).

Almost surely, 2^665712164 is an apocalyptic number.

It is an amenable number.

665712164 is a deficient number, since it is larger than the sum of its proper divisors (610313692).

665712164 is a wasteful number, since it uses less digits than its factorization.

665712164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996 (or 994 counting only the distinct ones).

The product of its digits is 60480, while the sum is 38.

The square root of 665712164 is about 25801.3984892292. The cubic root of 665712164 is about 873.1633481619.

The spelling of 665712164 in words is "six hundred sixty-five million, seven hundred twelve thousand, one hundred sixty-four".