166679869 has 2 divisors, whose sum is σ = 166679870. Its totient is φ = 166679868.

The previous prime is 166679831. The next prime is 166679879. The reversal of 166679869 is 968976661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161671225 + 5008644 = 12715^2 + 2238^2 .

It is a cyclic number.

It is not a de Polignac number, because 166679869 - 2¹⁷ = 166548797 is a prime.

It is a super-2 number, since 2×166679869² = 55564357459714322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166679819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83339934 + 83339935.

It is an arithmetic number, because the mean of its divisors is an integer number (83339935).

Almost surely, 2^166679869 is an apocalyptic number.

It is an amenable number.

166679869 is a deficient number, since it is larger than the sum of its proper divisors (1).

166679869 is an equidigital number, since it uses as much as digits as its factorization.

166679869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5878656, while the sum is 58.

The square root of 166679869 is about 12910.4558014038. The cubic root of 166679869 is about 550.3357388135.

The spelling of 166679869 in words is "one hundred sixty-six million, six hundred seventy-nine thousand, eight hundred sixty-nine".