166897897 has 2 divisors, whose sum is σ = 166897898. Its totient is φ = 166897896.

The previous prime is 166897889. The next prime is 166897931. The reversal of 166897897 is 798798661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124634896 + 42263001 = 11164^2 + 6501^2 .

It is a cyclic number.

It is not a de Polignac number, because 166897897 - 2³ = 166897889 is a prime.

It is not a weakly prime, because it can be changed into another prime (166897807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83448948 + 83448949.

It is an arithmetic number, because the mean of its divisors is an integer number (83448949).

Almost surely, 2^166897897 is an apocalyptic number.

It is an amenable number.

166897897 is a deficient number, since it is larger than the sum of its proper divisors (1).

166897897 is an equidigital number, since it uses as much as digits as its factorization.

166897897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9144576, while the sum is 61.

The square root of 166897897 is about 12918.8968956332. The cubic root of 166897897 is about 550.5755924554.

The spelling of 166897897 in words is "one hundred sixty-six million, eight hundred ninety-seven thousand, eight hundred ninety-seven".