166731994 has 64 divisors (see below), whose sum is σ = 307359360. Its totient is φ = 66816000.

The previous prime is 166731931. The next prime is 166732003. The reversal of 166731994 is 499137661.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 691714 + ... + 691954.

It is an arithmetic number, because the mean of its divisors is an integer number (4802490).

Almost surely, 2^166731994 is an apocalyptic number.

166731994 is a deficient number, since it is larger than the sum of its proper divisors (140627366).

166731994 is a wasteful number, since it uses less digits than its factorization.

166731994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367.

The product of its digits is 244944, while the sum is 46.

The square root of 166731994 is about 12912.4743562185. The cubic root of 166731994 is about 550.3931007908.

The spelling of 166731994 in words is "one hundred sixty-six million, seven hundred thirty-one thousand, nine hundred ninety-four".