166722073 has 8 divisors (see below), whose sum is σ = 197110080. Its totient is φ = 137976720.

The previous prime is 166722071. The next prime is 166722091. The reversal of 166722073 is 370227661.

It is a happy number.

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

It is not a de Polignac number, because 166722073 - 2¹ = 166722071 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166722071) 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, 410443 + ... + 410848.

It is an arithmetic number, because the mean of its divisors is an integer number (24638760).

Almost surely, 2^166722073 is an apocalyptic number.

It is an amenable number.

166722073 is a deficient number, since it is larger than the sum of its proper divisors (30388007).

166722073 is an equidigital number, since it uses as much as digits as its factorization.

166722073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821327.

The product of its (nonzero) digits is 21168, while the sum is 34.

The square root of 166722073 is about 12912.0901871076. The cubic root of 166722073 is about 550.3821839533.

The spelling of 166722073 in words is "one hundred sixty-six million, seven hundred twenty-two thousand, seventy-three".