166993187904 has 63 divisors (see below), whose sum is σ = 478683934807. Its totient is φ = 55661126784.

The previous prime is 166993187873. The next prime is 166993187957. The reversal of 166993187904 is 409781399661.

The square root of 166993187904 is 408648.

It is a perfect power (a square), and thus also a powerful number.

166993187904 is a `hidden beast` number, since 166 + 99 + 318 + 79 + 0 + 4 = 666.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 9799039 + ... + 9816065.

Almost surely, 2^166993187904 is an apocalyptic number.

166993187904 is the 408648-th square number.

It is an amenable number.

166993187904 is an abundant number, since it is smaller than the sum of its proper divisors (311690746903).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166993187904 is an frugal number, since it uses more digits than its factorization.

166993187904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34072 (or 17032 counting only the distinct ones).

The product of its (nonzero) digits is 17635968, while the sum is 63.

The spelling of 166993187904 in words is "one hundred sixty-six billion, nine hundred ninety-three million, one hundred eighty-seven thousand, nine hundred four".