166660877 has 8 divisors (see below), whose sum is σ = 176597496. Its totient is φ = 156739072.

The previous prime is 166660811. The next prime is 166660909. The reversal of 166660877 is 778066661.

It can be written as a sum of positive squares in 4 ways, for example, as 12752041 + 153908836 = 3571^2 + 12406^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166660877 - 2¹⁰ = 166659853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166660177) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26633 + ... + 32289.

It is an arithmetic number, because the mean of its divisors is an integer number (22074687).

Almost surely, 2^166660877 is an apocalyptic number.

166660877 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

166660877 is a deficient number, since it is larger than the sum of its proper divisors (9936619).

166660877 is a wasteful number, since it uses less digits than its factorization.

166660877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7407.

The product of its (nonzero) digits is 508032, while the sum is 47.

The square root of 166660877 is about 12909.7202525849. The cubic root of 166660877 is about 550.3148357226.

The spelling of 166660877 in words is "one hundred sixty-six million, six hundred sixty thousand, eight hundred seventy-seven".