166393969 has 8 divisors (see below), whose sum is σ = 191848320. Its totient is φ = 141360576.

The previous prime is 166393939. The next prime is 166393991. The reversal of 166393969 is 969393661.

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

It is not a de Polignac number, because 166393969 - 2¹¹ = 166391921 is a prime.

It is a super-2 number, since 2×166393969² = 55373905839145922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166393939) 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, 104389 + ... + 105970.

It is an arithmetic number, because the mean of its divisors is an integer number (23981040).

Almost surely, 2^166393969 is an apocalyptic number.

It is an amenable number.

166393969 is a deficient number, since it is larger than the sum of its proper divisors (25454351).

166393969 is a wasteful number, since it uses less digits than its factorization.

166393969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210479.

The product of its digits is 1417176, while the sum is 52.

The square root of 166393969 is about 12899.3786284456. The cubic root of 166393969 is about 550.0209016850.

The spelling of 166393969 in words is "one hundred sixty-six million, three hundred ninety-three thousand, nine hundred sixty-nine".