1966867769 has 2 divisors, whose sum is σ = 1966867770. Its totient is φ = 1966867768.

The previous prime is 1966867733. The next prime is 1966867781. The reversal of 1966867769 is 9677686691.

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., 1953640000 + 13227769 = 44200^2 + 3637^2 .

It is a cyclic number.

It is not a de Polignac number, because 1966867769 - 2²⁸ = 1698432313 is a prime.

It is a super-2 number, since 2×1966867769² = 7737137641462074722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1966867729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 983433884 + 983433885.

It is an arithmetic number, because the mean of its divisors is an integer number (983433885).

Almost surely, 2^1966867769 is an apocalyptic number.

It is an amenable number.

1966867769 is a deficient number, since it is larger than the sum of its proper divisors (1).

1966867769 is an equidigital number, since it uses as much as digits as its factorization.

1966867769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41150592, while the sum is 65.

The square root of 1966867769 is about 44349.3829607583. The cubic root of 1966867769 is about 1252.9249411570.

The spelling of 1966867769 in words is "one billion, nine hundred sixty-six million, eight hundred sixty-seven thousand, seven hundred sixty-nine".