166722379 has 4 divisors (see below), whose sum is σ = 166751080. Its totient is φ = 166693680.

The previous prime is 166722343. The next prime is 166722389. The reversal of 166722379 is 973227661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 166722379 - 2⁷ = 166722251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166722319) 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, 2217 + ... + 18394.

It is an arithmetic number, because the mean of its divisors is an integer number (41687770).

Almost surely, 2^166722379 is an apocalyptic number.

166722379 is a deficient number, since it is larger than the sum of its proper divisors (28701).

166722379 is an equidigital number, since it uses as much as digits as its factorization.

166722379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28700.

The product of its digits is 190512, while the sum is 43.

The square root of 166722379 is about 12912.1020364618. The cubic root of 166722379 is about 550.3825206751.

The spelling of 166722379 in words is "one hundred sixty-six million, seven hundred twenty-two thousand, three hundred seventy-nine".