166469969 has 4 divisors (see below), whose sum is σ = 171840000. Its totient is φ = 161099940.

The previous prime is 166469959. The next prime is 166469971. The reversal of 166469969 is 969964661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 969964661 = 59 ⋅16440079.

It is a cyclic number.

It is not a de Polignac number, because 166469969 - 2⁸ = 166469713 is a prime.

It is a super-2 number, since 2×166469969² = 55424501157721922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166469909) 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, 2684969 + ... + 2685030.

It is an arithmetic number, because the mean of its divisors is an integer number (42960000).

Almost surely, 2^166469969 is an apocalyptic number.

It is an amenable number.

166469969 is a deficient number, since it is larger than the sum of its proper divisors (5370031).

166469969 is an equidigital number, since it uses as much as digits as its factorization.

166469969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5370030.

The product of its digits is 3779136, while the sum is 56.

The square root of 166469969 is about 12902.3241704741. The cubic root of 166469969 is about 550.1046291305.

The spelling of 166469969 in words is "one hundred sixty-six million, four hundred sixty-nine thousand, nine hundred sixty-nine".