3665431691 has 2 divisors, whose sum is σ = 3665431692. Its totient is φ = 3665431690.

The previous prime is 3665431687. The next prime is 3665431711. The reversal of 3665431691 is 1961345663.

3665431691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (1961345663) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3665431691 - 2² = 3665431687 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (3665431291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1832715845 + 1832715846.

It is an arithmetic number, because the mean of its divisors is an integer number (1832715846).

Almost surely, 2^3665431691 is an apocalyptic number.

3665431691 is a deficient number, since it is larger than the sum of its proper divisors (1).

3665431691 is an equidigital number, since it uses as much as digits as its factorization.

3665431691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920, while the sum is 44.

The square root of 3665431691 is about 60542.8087471997. The cubic root of 3665431691 is about 1541.8485267200.

The spelling of 3665431691 in words is "three billion, six hundred sixty-five million, four hundred thirty-one thousand, six hundred ninety-one".