2160665641 has 2 divisors, whose sum is σ = 2160665642. Its totient is φ = 2160665640.

The previous prime is 2160665593. The next prime is 2160665657. The reversal of 2160665641 is 1465660612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1788021225 + 372644416 = 42285^2 + 19304^2 .

It is a cyclic number.

It is not a de Polignac number, because 2160665641 - 2²³ = 2152277033 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2160665641.

It is not a weakly prime, because it can be changed into another prime (2160668641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080332820 + 1080332821.

It is an arithmetic number, because the mean of its divisors is an integer number (1080332821).

Almost surely, 2^2160665641 is an apocalyptic number.

It is an amenable number.

2160665641 is a deficient number, since it is larger than the sum of its proper divisors (1).

2160665641 is an equidigital number, since it uses as much as digits as its factorization.

2160665641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 2160665641 is about 46482.9607598311. The cubic root of 2160665641 is about 1292.7935855723.

The spelling of 2160665641 in words is "two billion, one hundred sixty million, six hundred sixty-five thousand, six hundred forty-one".