3691077661 has 2 divisors, whose sum is σ = 3691077662. Its totient is φ = 3691077660.

The previous prime is 3691077653. The next prime is 3691077703. The reversal of 3691077661 is 1667701963.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3496475161 + 194602500 = 59131^2 + 13950^2 .

It is a cyclic number.

It is not a de Polignac number, because 3691077661 - 2³ = 3691077653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3691077601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1845538830 + 1845538831.

It is an arithmetic number, because the mean of its divisors is an integer number (1845538831).

Almost surely, 2^3691077661 is an apocalyptic number.

It is an amenable number.

3691077661 is a deficient number, since it is larger than the sum of its proper divisors (1).

3691077661 is an equidigital number, since it uses as much as digits as its factorization.

3691077661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 285768, while the sum is 46.

The square root of 3691077661 is about 60754.2398602764. The cubic root of 3691077661 is about 1545.4361292543.

The spelling of 3691077661 in words is "three billion, six hundred ninety-one million, seventy-seven thousand, six hundred sixty-one".