166187793 has 4 divisors (see below), whose sum is σ = 221583728. Its totient is φ = 110791860.

The previous prime is 166187761. The next prime is 166187849. The reversal of 166187793 is 397781661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 166187793 - 2⁵ = 166187761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166187293) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27697963 + ... + 27697968.

It is an arithmetic number, because the mean of its divisors is an integer number (55395932).

Almost surely, 2^166187793 is an apocalyptic number.

It is an amenable number.

166187793 is a deficient number, since it is larger than the sum of its proper divisors (55395935).

166187793 is an equidigital number, since it uses as much as digits as its factorization.

166187793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55395934.

The product of its digits is 381024, while the sum is 48.

The square root of 166187793 is about 12891.3844485377. The cubic root of 166187793 is about 549.7936338736.

The spelling of 166187793 in words is "one hundred sixty-six million, one hundred eighty-seven thousand, seven hundred ninety-three".