166744919 has 8 divisors (see below), whose sum is σ = 182107008. Its totient is φ = 151416760.

The previous prime is 166744913. The next prime is 166744961. The reversal of 166744919 is 919447661.

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

It is a de Polignac number, because none of the positive numbers 2^k-166744919 is a prime.

It is a super-2 number, since 2×166744919² = 55607736024633122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166744913) 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, 2414 + ... + 18420.

It is an arithmetic number, because the mean of its divisors is an integer number (22763376).

Almost surely, 2^166744919 is an apocalyptic number.

166744919 is a deficient number, since it is larger than the sum of its proper divisors (15362089).

166744919 is a wasteful number, since it uses less digits than its factorization.

166744919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16965.

The product of its digits is 326592, while the sum is 47.

The square root of 166744919 is about 12912.9748315406. The cubic root of 166744919 is about 550.4073225105.

The spelling of 166744919 in words is "one hundred sixty-six million, seven hundred forty-four thousand, nine hundred nineteen".