166938659 has 2 divisors, whose sum is σ = 166938660. Its totient is φ = 166938658.

The previous prime is 166938641. The next prime is 166938683. The reversal of 166938659 is 956839661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166938659 - 2¹⁶ = 166873123 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166938659.

It is not a weakly prime, because it can be changed into another prime (166938619) 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, 83469329 + 83469330.

It is an arithmetic number, because the mean of its divisors is an integer number (83469330).

Almost surely, 2^166938659 is an apocalyptic number.

166938659 is a deficient number, since it is larger than the sum of its proper divisors (1).

166938659 is an equidigital number, since it uses as much as digits as its factorization.

166938659 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2099520, while the sum is 53.

The square root of 166938659 is about 12920.4744107947. The cubic root of 166938659 is about 550.6204117449.

It can be divided in two parts, 16693 and 8659, that added together give a palindrome (25352).

The spelling of 166938659 in words is "one hundred sixty-six million, nine hundred thirty-eight thousand, six hundred fifty-nine".