166668533537 has 6 divisors (see below), whose sum is σ = 183197644434. Its totient is φ = 151516848560.

The previous prime is 166668533497. The next prime is 166668533561. The reversal of 166668533537 is 735335866661.

It can be written as a sum of positive squares in only one way, i.e., 103707185296 + 62961348241 = 322036^2 + 250921^2 .

It is not a de Polignac number, because 166668533537 - 2²⁶ = 166601424673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166668533597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 688712828 + ... + 688713069.

It is an arithmetic number, because the mean of its divisors is an integer number (30532940739).

Almost surely, 2^166668533537 is an apocalyptic number.

It is an amenable number.

166668533537 is a deficient number, since it is larger than the sum of its proper divisors (16529110897).

166668533537 is a wasteful number, since it uses less digits than its factorization.

166668533537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1377425919 (or 1377425908 counting only the distinct ones).

The product of its digits is 48988800, while the sum is 59.

The spelling of 166668533537 in words is "one hundred sixty-six billion, six hundred sixty-eight million, five hundred thirty-three thousand, five hundred thirty-seven".