166166993 has 8 divisors (see below), whose sum is σ = 176054112. Its totient is φ = 156292416.

The previous prime is 166166981. The next prime is 166167077. The reversal of 166166993 is 399661661.

166166993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166166993 - 2⁴ = 166166977 is a prime.

It is a super-2 number, since 2×166166993² = 55222939125324098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166166933) 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, 50546 + ... + 53732.

It is an arithmetic number, because the mean of its divisors is an integer number (22006764).

Almost surely, 2^166166993 is an apocalyptic number.

It is an amenable number.

166166993 is a deficient number, since it is larger than the sum of its proper divisors (9887119).

166166993 is a wasteful number, since it uses less digits than its factorization.

166166993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6271.

The product of its digits is 314928, while the sum is 47.

The square root of 166166993 is about 12890.5776829435. The cubic root of 166166993 is about 549.7706955969.

The spelling of 166166993 in words is "one hundred sixty-six million, one hundred sixty-six thousand, nine hundred ninety-three".