166551994 has 16 divisors (see below), whose sum is σ = 285683328. Its totient is φ = 71338032.

The previous prime is 166551989. The next prime is 166551997. The reversal of 166551994 is 499155661.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (166551997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45459 + ... + 48985.

It is an arithmetic number, because the mean of its divisors is an integer number (17855208).

Almost surely, 2^166551994 is an apocalyptic number.

166551994 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

166551994 is a deficient number, since it is larger than the sum of its proper divisors (119131334).

166551994 is a wasteful number, since it uses less digits than its factorization.

166551994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6909.

The product of its digits is 291600, while the sum is 46.

The square root of 166551994 is about 12905.5024698769. The cubic root of 166551994 is about 550.1949655906.

The spelling of 166551994 in words is "one hundred sixty-six million, five hundred fifty-one thousand, nine hundred ninety-four".