166766657 has 2 divisors, whose sum is σ = 166766658. Its totient is φ = 166766656.

The previous prime is 166766653. The next prime is 166766683. The reversal of 166766657 is 756667661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154157056 + 12609601 = 12416^2 + 3551^2 .

It is a cyclic number.

It is not a de Polignac number, because 166766657 - 2² = 166766653 is a prime.

It is a super-2 number, since 2×166766657² = 55622235773911298, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (166766653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83383328 + 83383329.

It is an arithmetic number, because the mean of its divisors is an integer number (83383329).

Almost surely, 2^166766657 is an apocalyptic number.

It is an amenable number.

166766657 is a deficient number, since it is larger than the sum of its proper divisors (1).

166766657 is an equidigital number, since it uses as much as digits as its factorization.

166766657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1905120, while the sum is 50.

The square root of 166766657 is about 12913.8165156549. The cubic root of 166766657 is about 550.4312397499.

The spelling of 166766657 in words is "one hundred sixty-six million, seven hundred sixty-six thousand, six hundred fifty-seven".