166764889 has 2 divisors, whose sum is σ = 166764890. Its totient is φ = 166764888.

The previous prime is 166764863. The next prime is 166764947. The reversal of 166764889 is 988467661.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165894400 + 870489 = 12880^2 + 933^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166764889 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (166764839) 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, 83382444 + 83382445.

It is an arithmetic number, because the mean of its divisors is an integer number (83382445).

Almost surely, 2^166764889 is an apocalyptic number.

It is an amenable number.

166764889 is a deficient number, since it is larger than the sum of its proper divisors (1).

166764889 is an equidigital number, since it uses as much as digits as its factorization.

166764889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3483648, while the sum is 55.

The square root of 166764889 is about 12913.7480616589. The cubic root of 166764889 is about 550.4292945852.

The spelling of 166764889 in words is "one hundred sixty-six million, seven hundred sixty-four thousand, eight hundred eighty-nine".