166091700890 has 32 divisors (see below), whose sum is σ = 302625542016. Its totient is φ = 65623550400.

The previous prime is 166091700857. The next prime is 166091700941. The reversal of 166091700890 is 98007190661.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5089064 + ... + 5121596.

It is an arithmetic number, because the mean of its divisors is an integer number (9457048188).

Almost surely, 2^166091700890 is an apocalyptic number.

166091700890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166091700890 is a deficient number, since it is larger than the sum of its proper divisors (136533841126).

166091700890 is a wasteful number, since it uses less digits than its factorization.

166091700890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38774.

The product of its (nonzero) digits is 163296, while the sum is 47.

The spelling of 166091700890 in words is "one hundred sixty-six billion, ninety-one million, seven hundred thousand, eight hundred ninety".