166291173893 has 16 divisors (see below), whose sum is σ = 189884224320. Its totient is φ = 144359127936.

The previous prime is 166291173871. The next prime is 166291174019. The reversal of 166291173893 is 398371192661.

It is a cyclic number.

It is not a de Polignac number, because 166291173893 - 2²⁰ = 166290125317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166291173823) 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, 2423255 + ... + 2490932.

It is an arithmetic number, because the mean of its divisors is an integer number (11867764020).

Almost surely, 2^166291173893 is an apocalyptic number.

166291173893 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

166291173893 is a deficient number, since it is larger than the sum of its proper divisors (23593050427).

166291173893 is a wasteful number, since it uses less digits than its factorization.

166291173893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4914356.

The product of its digits is 2939328, while the sum is 56.

The spelling of 166291173893 in words is "one hundred sixty-six billion, two hundred ninety-one million, one hundred seventy-three thousand, eight hundred ninety-three".