166910813 has 2 divisors, whose sum is σ = 166910814. Its totient is φ = 166910812.

The previous prime is 166910791. The next prime is 166910819. The reversal of 166910813 is 318019661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 162741049 + 4169764 = 12757^2 + 2042^2 .

It is a cyclic number.

It is not a de Polignac number, because 166910813 - 2²² = 162716509 is a prime.

It is a super-4 number, since 4×166910813⁴ (a number of 34 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166910819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83455406 + 83455407.

It is an arithmetic number, because the mean of its divisors is an integer number (83455407).

Almost surely, 2^166910813 is an apocalyptic number.

It is an amenable number.

166910813 is a deficient number, since it is larger than the sum of its proper divisors (1).

166910813 is an equidigital number, since it uses as much as digits as its factorization.

166910813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 166910813 is about 12919.3967738436. The cubic root of 166910813 is about 550.5897948531.

The spelling of 166910813 in words is "one hundred sixty-six million, nine hundred ten thousand, eight hundred thirteen".