166663769 has 2 divisors, whose sum is σ = 166663770. Its totient is φ = 166663768.

The previous prime is 166663741. The next prime is 166663793. The reversal of 166663769 is 967366661.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164737225 + 1926544 = 12835^2 + 1388^2 .

It is a cyclic number.

It is not a de Polignac number, because 166663769 - 2⁸ = 166663513 is a prime.

It is a super-2 number, since 2×166663769² = 55553623794570722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (166663069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83331884 + 83331885.

It is an arithmetic number, because the mean of its divisors is an integer number (83331885).

Almost surely, 2^166663769 is an apocalyptic number.

It is an amenable number.

166663769 is a deficient number, since it is larger than the sum of its proper divisors (1).

166663769 is an equidigital number, since it uses as much as digits as its factorization.

166663769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1469664, while the sum is 50.

The square root of 166663769 is about 12909.8322607228. The cubic root of 166663769 is about 550.3180188358.

The spelling of 166663769 in words is "one hundred sixty-six million, six hundred sixty-three thousand, seven hundred sixty-nine".