4056640661 has 2 divisors, whose sum is σ = 4056640662. Its totient is φ = 4056640660.

The previous prime is 4056640613. The next prime is 4056640667. The reversal of 4056640661 is 1660466504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3285467761 + 771172900 = 57319^2 + 27770^2 .

It is a cyclic number.

It is not a de Polignac number, because 4056640661 - 2³⁰ = 2982898837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4056640667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2028320330 + 2028320331.

It is an arithmetic number, because the mean of its divisors is an integer number (2028320331).

Almost surely, 2^4056640661 is an apocalyptic number.

It is an amenable number.

4056640661 is a deficient number, since it is larger than the sum of its proper divisors (1).

4056640661 is an equidigital number, since it uses as much as digits as its factorization.

4056640661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 4056640661 is about 63691.7628975678. The cubic root of 4056640661 is about 1594.8585824049.

The spelling of 4056640661 in words is "four billion, fifty-six million, six hundred forty thousand, six hundred sixty-one".