166722407 has 8 divisors (see below), whose sum is σ = 171502512. Its totient is φ = 161956800.

The previous prime is 166722403. The next prime is 166722461. The reversal of 166722407 is 704227661.

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 166722407 - 2² = 166722403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166722401) 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, 22307 + ... + 28827.

It is an arithmetic number, because the mean of its divisors is an integer number (21437814).

Almost surely, 2^166722407 is an apocalyptic number.

166722407 is a deficient number, since it is larger than the sum of its proper divisors (4780105).

166722407 is an equidigital number, since it uses as much as digits as its factorization.

166722407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7249.

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 166722407 is about 12912.1031207159. The cubic root of 166722407 is about 550.3825514862.

The spelling of 166722407 in words is "one hundred sixty-six million, seven hundred twenty-two thousand, four hundred seven".