166489537 has 2 divisors, whose sum is σ = 166489538. Its totient is φ = 166489536.

The previous prime is 166489523. The next prime is 166489597. The reversal of 166489537 is 735984661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111492481 + 54997056 = 10559^2 + 7416^2 .

It is an emirp because it is prime and its reverse (735984661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166489537 is a prime.

It is not a weakly prime, because it can be changed into another prime (166489597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83244768 + 83244769.

It is an arithmetic number, because the mean of its divisors is an integer number (83244769).

Almost surely, 2^166489537 is an apocalyptic number.

It is an amenable number.

166489537 is a deficient number, since it is larger than the sum of its proper divisors (1).

166489537 is an equidigital number, since it uses as much as digits as its factorization.

166489537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1088640, while the sum is 49.

The square root of 166489537 is about 12903.0824611796. The cubic root of 166489537 is about 550.1261826188.

The spelling of 166489537 in words is "one hundred sixty-six million, four hundred eighty-nine thousand, five hundred thirty-seven".