166430993 has 2 divisors, whose sum is σ = 166430994. Its totient is φ = 166430992.

The previous prime is 166430989. The next prime is 166431007. The reversal of 166430993 is 399034661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150970369 + 15460624 = 12287^2 + 3932^2 .

It is a cyclic number.

It is not a de Polignac number, because 166430993 - 2² = 166430989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166430993.

It is not a weakly prime, because it can be changed into another prime (166430923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83215496 + 83215497.

It is an arithmetic number, because the mean of its divisors is an integer number (83215497).

Almost surely, 2^166430993 is an apocalyptic number.

It is an amenable number.

166430993 is a deficient number, since it is larger than the sum of its proper divisors (1).

166430993 is an equidigital number, since it uses as much as digits as its factorization.

166430993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 104976, while the sum is 41.

The square root of 166430993 is about 12900.8136565102. The cubic root of 166430993 is about 550.0616933551.

The spelling of 166430993 in words is "one hundred sixty-six million, four hundred thirty thousand, nine hundred ninety-three".