166663976 has 8 divisors (see below), whose sum is σ = 312494970. Its totient is φ = 83331984.

The previous prime is 166663961. The next prime is 166663979. The reversal of 166663976 is 679366661.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 89680900 + 76983076 = 9470^2 + 8774^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×166663976² = 55553761792257152, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166663979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10416491 + ... + 10416506.

Almost surely, 2^166663976 is an apocalyptic number.

It is an amenable number.

166663976 is a deficient number, since it is larger than the sum of its proper divisors (145830994).

166663976 is a wasteful number, since it uses less digits than its factorization.

166663976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20833003 (or 20832999 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 50.

The square root of 166663976 is about 12909.8402778656. The cubic root of 166663976 is about 550.3182466713.

The spelling of 166663976 in words is "one hundred sixty-six million, six hundred sixty-three thousand, nine hundred seventy-six".