166878993 has 8 divisors (see below), whose sum is σ = 222710400. Its totient is φ = 111150128.

The previous prime is 166878947. The next prime is 166878997. The reversal of 166878993 is 399878661.

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 166878993 - 2¹³ = 166870801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166878997) 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, 21753 + ... + 28406.

It is an arithmetic number, because the mean of its divisors is an integer number (27838800).

Almost surely, 2^166878993 is an apocalyptic number.

It is an amenable number.

166878993 is a deficient number, since it is larger than the sum of its proper divisors (55831407).

166878993 is a wasteful number, since it uses less digits than its factorization.

166878993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51271.

The product of its digits is 3919104, while the sum is 57.

The square root of 166878993 is about 12918.1652334997. The cubic root of 166878993 is about 550.5548043485.

The spelling of 166878993 in words is "one hundred sixty-six million, eight hundred seventy-eight thousand, nine hundred ninety-three".