166760621 has 2 divisors, whose sum is σ = 166760622. Its totient is φ = 166760620.

The previous prime is 166760593. The next prime is 166760623. The reversal of 166760621 is 126067661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85562500 + 81198121 = 9250^2 + 9011^2 .

It is a cyclic number.

It is not a de Polignac number, because 166760621 - 2²⁶ = 99651757 is a prime.

Together with 166760623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166760623) 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, 83380310 + 83380311.

It is an arithmetic number, because the mean of its divisors is an integer number (83380311).

Almost surely, 2^166760621 is an apocalyptic number.

It is an amenable number.

166760621 is a deficient number, since it is larger than the sum of its proper divisors (1).

166760621 is an equidigital number, since it uses as much as digits as its factorization.

166760621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 166760621 is about 12913.5828103590. The cubic root of 166760621 is about 550.4245988480.

The spelling of 166760621 in words is "one hundred sixty-six million, seven hundred sixty thousand, six hundred twenty-one".