166219673569537 has 12 divisors (see below), whose sum is σ = 197005835677716. Its totient is φ = 139785817123680.

The previous prime is 166219673569529. The next prime is 166219673569541. The reversal of 166219673569537 is 735965376912661.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 153314939325681 + 12904734243856 = 12382041^2 + 3592316^2 .

It is not a de Polignac number, because 166219673569537 - 2³ = 166219673569529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166219673269537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32002244914 + ... + 32002250107.

It is an arithmetic number, because the mean of its divisors is an integer number (16417152973143).

Almost surely, 2^{166219673569537} is an apocalyptic number.

It is an amenable number.

166219673569537 is a deficient number, since it is larger than the sum of its proper divisors (30786162108179).

166219673569537 is an equidigital number, since it uses as much as digits as its factorization.

166219673569537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64004495088 (or 64004495081 counting only the distinct ones).

The product of its digits is 2314720800, while the sum is 76.

The spelling of 166219673569537 in words is "one hundred sixty-six trillion, two hundred nineteen billion, six hundred seventy-three million, five hundred sixty-nine thousand, five hundred thirty-seven".