166664501 has 2 divisors, whose sum is σ = 166664502. Its totient is φ = 166664500.

The previous prime is 166664441. The next prime is 166664543. The reversal of 166664501 is 105466661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105042001 + 61622500 = 10249^2 + 7850^2 .

It is a cyclic number.

It is not a de Polignac number, because 166664501 - 2⁶ = 166664437 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166664551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83332250 + 83332251.

It is an arithmetic number, because the mean of its divisors is an integer number (83332251).

Almost surely, 2^166664501 is an apocalyptic number.

It is an amenable number.

166664501 is a deficient number, since it is larger than the sum of its proper divisors (1).

166664501 is an equidigital number, since it uses as much as digits as its factorization.

166664501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 166664501 is about 12909.8606111762. The cubic root of 166664501 is about 550.3188245142.

The spelling of 166664501 in words is "one hundred sixty-six million, six hundred sixty-four thousand, five hundred one".