666665164 has 48 divisors (see below), whose sum is σ = 1307529216. Its totient is φ = 294840000.

The previous prime is 666665161. The next prime is 666665171. The reversal of 666665164 is 461566666.

It is a super-2 number, since 2×666665164² = 888884881782293792, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (666665161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 295039 + ... + 297289.

It is an arithmetic number, because the mean of its divisors is an integer number (27240192).

Almost surely, 2^666665164 is an apocalyptic number.

It is an amenable number.

666665164 is a deficient number, since it is larger than the sum of its proper divisors (640864052).

666665164 is a wasteful number, since it uses less digits than its factorization.

666665164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2446 (or 2444 counting only the distinct ones).

The product of its digits is 933120, while the sum is 46.

The square root of 666665164 is about 25819.8598756848. The cubic root of 666665164 is about 873.5798083857.

The spelling of 666665164 in words is "six hundred sixty-six million, six hundred sixty-five thousand, one hundred sixty-four".