166650961 has 2 divisors, whose sum is σ = 166650962. Its totient is φ = 166650960.

The previous prime is 166650941. The next prime is 166650971. The reversal of 166650961 is 169056661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164634561 + 2016400 = 12831^2 + 1420^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166650961 is a prime.

It is not a weakly prime, because it can be changed into another prime (166650901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83325480 + 83325481.

It is an arithmetic number, because the mean of its divisors is an integer number (83325481).

Almost surely, 2^166650961 is an apocalyptic number.

It is an amenable number.

166650961 is a deficient number, since it is larger than the sum of its proper divisors (1).

166650961 is an equidigital number, since it uses as much as digits as its factorization.

166650961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 166650961 is about 12909.3361951729. The cubic root of 166650961 is about 550.3039212832.

The spelling of 166650961 in words is "one hundred sixty-six million, six hundred fifty thousand, nine hundred sixty-one".