166961017 has 2 divisors, whose sum is σ = 166961018. Its totient is φ = 166961016.

The previous prime is 166960991. The next prime is 166961051. The reversal of 166961017 is 710169661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122124601 + 44836416 = 11051^2 + 6696^2 .

It is a cyclic number.

It is not a de Polignac number, because 166961017 - 2⁷ = 166960889 is a prime.

It is not a weakly prime, because it can be changed into another prime (166962017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83480508 + 83480509.

It is an arithmetic number, because the mean of its divisors is an integer number (83480509).

Almost surely, 2^166961017 is an apocalyptic number.

It is an amenable number.

166961017 is a deficient number, since it is larger than the sum of its proper divisors (1).

166961017 is an equidigital number, since it uses as much as digits as its factorization.

166961017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 166961017 is about 12921.3395977352. The cubic root of 166961017 is about 550.6449920742.

The spelling of 166961017 in words is "one hundred sixty-six million, nine hundred sixty-one thousand, seventeen".