166506668053 has 16 divisors (see below), whose sum is σ = 184311418752. Its totient is φ = 149150592000.

The previous prime is 166506668021. The next prime is 166506668101. The reversal of 166506668053 is 350866605661.

It is a cyclic number.

It is not a de Polignac number, because 166506668053 - 2⁵ = 166506668021 is a prime.

It is a super-2 number, since 2×166506668053² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166506669053) 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 in 15 ways as a sum of consecutive naturals, for example, 727333 + ... + 928453.

It is an arithmetic number, because the mean of its divisors is an integer number (11519463672).

Almost surely, 2^166506668053 is an apocalyptic number.

It is an amenable number.

166506668053 is a deficient number, since it is larger than the sum of its proper divisors (17804750699).

166506668053 is a wasteful number, since it uses less digits than its factorization.

166506668053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202236.

The product of its (nonzero) digits is 4665600, while the sum is 52.

The spelling of 166506668053 in words is "one hundred sixty-six billion, five hundred six million, six hundred sixty-eight thousand, fifty-three".