166886553599 has 16 divisors (see below), whose sum is σ = 184094726400. Its totient is φ = 150579861696.

The previous prime is 166886553593. The next prime is 166886553653. The reversal of 166886553599 is 995355688661.

It is a cyclic number.

It is not a de Polignac number, because 166886553599 - 2³⁶ = 98167076863 is a prime.

It is a super-2 number, since 2×166886553599² (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 (166886553593) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 717689 + ... + 921330.

It is an arithmetic number, because the mean of its divisors is an integer number (11505920400).

Almost surely, 2^166886553599 is an apocalyptic number.

166886553599 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

166886553599 is a deficient number, since it is larger than the sum of its proper divisors (17208172801).

166886553599 is a wasteful number, since it uses less digits than its factorization.

166886553599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1639294.

The product of its digits is 419904000, while the sum is 71.

The spelling of 166886553599 in words is "one hundred sixty-six billion, eight hundred eighty-six million, five hundred fifty-three thousand, five hundred ninety-nine".