166393939 has 2 divisors, whose sum is σ = 166393940. Its totient is φ = 166393938.

The previous prime is 166393873. The next prime is 166393991. The reversal of 166393939 is 939393661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166393939 - 2²⁷ = 32176211 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166393892 and 166393901.

It is not a weakly prime, because it can be changed into another prime (166393999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83196969 + 83196970.

It is an arithmetic number, because the mean of its divisors is an integer number (83196970).

Almost surely, 2^166393939 is an apocalyptic number.

166393939 is a deficient number, since it is larger than the sum of its proper divisors (1).

166393939 is an equidigital number, since it uses as much as digits as its factorization.

166393939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 708588, while the sum is 49.

The square root of 166393939 is about 12899.3774655989. The cubic root of 166393939 is about 550.0208686297.

The spelling of 166393939 in words is "one hundred sixty-six million, three hundred ninety-three thousand, nine hundred thirty-nine".