166946969 has 6 divisors (see below), whose sum is σ = 194203674. Its totient is φ = 143097360.

The previous prime is 166946963. The next prime is 166946971. The reversal of 166946969 is 969649661.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 140114569 + 26832400 = 11837^2 + 5180^2 .

It is not a de Polignac number, because 166946969 - 2⁸ = 166946713 is a prime.

It is a super-2 number, since 2×166946969² = 55742580916573922, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166946963) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1703492 + ... + 1703589.

It is an arithmetic number, because the mean of its divisors is an integer number (32367279).

Almost surely, 2^166946969 is an apocalyptic number.

It is an amenable number.

166946969 is a deficient number, since it is larger than the sum of its proper divisors (27256705).

166946969 is an equidigital number, since it uses as much as digits as its factorization.

166946969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3407095 (or 3407088 counting only the distinct ones).

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

The square root of 166946969 is about 12920.7959894118. The cubic root of 166946969 is about 550.6295479944.

The spelling of 166946969 in words is "one hundred sixty-six million, nine hundred forty-six thousand, nine hundred sixty-nine".