166897793 has 2 divisors, whose sum is σ = 166897794. Its totient is φ = 166897792.

The previous prime is 166897777. The next prime is 166897807. The reversal of 166897793 is 397798661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141324544 + 25573249 = 11888^2 + 5057^2 .

It is a cyclic number.

It is not a de Polignac number, because 166897793 - 2⁴ = 166897777 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (166897693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83448896 + 83448897.

It is an arithmetic number, because the mean of its divisors is an integer number (83448897).

Almost surely, 2^166897793 is an apocalyptic number.

It is an amenable number.

166897793 is a deficient number, since it is larger than the sum of its proper divisors (1).

166897793 is an equidigital number, since it uses as much as digits as its factorization.

166897793 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3429216, while the sum is 56.

The square root of 166897793 is about 12918.8928705211. The cubic root of 166897793 is about 550.5754780943.

The spelling of 166897793 in words is "one hundred sixty-six million, eight hundred ninety-seven thousand, seven hundred ninety-three".