166389004 has 12 divisors (see below), whose sum is σ = 306506200. Its totient is φ = 78815808.

The previous prime is 166388953. The next prime is 166389011. The reversal of 166389004 is 400983661.

166389004 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×166389004² = 55370601304224032, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1094589 + ... + 1094740.

Almost surely, 2^166389004 is an apocalyptic number.

It is an amenable number.

166389004 is a deficient number, since it is larger than the sum of its proper divisors (140117196).

166389004 is a wasteful number, since it uses less digits than its factorization.

166389004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2189352 (or 2189350 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 166389004 is about 12899.1861758795. The cubic root of 166389004 is about 550.0154309720.

The spelling of 166389004 in words is "one hundred sixty-six million, three hundred eighty-nine thousand, four".