2160665657 has 2 divisors, whose sum is σ = 2160665658. Its totient is φ = 2160665656.

The previous prime is 2160665641. The next prime is 2160665723. The reversal of 2160665657 is 7565660612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1778814976 + 381850681 = 42176^2 + 19541^2 .

It is a cyclic number.

It is not a de Polignac number, because 2160665657 - 2⁴ = 2160665641 is a prime.

It is not a weakly prime, because it can be changed into another prime (2160865657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080332828 + 1080332829.

It is an arithmetic number, because the mean of its divisors is an integer number (1080332829).

Almost surely, 2^2160665657 is an apocalyptic number.

It is an amenable number.

2160665657 is a deficient number, since it is larger than the sum of its proper divisors (1).

2160665657 is an equidigital number, since it uses as much as digits as its factorization.

2160665657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 453600, while the sum is 44.

The square root of 2160665657 is about 46482.9609319372. The cubic root of 2160665657 is about 1292.7935887634.

The spelling of 2160665657 in words is "two billion, one hundred sixty million, six hundred sixty-five thousand, six hundred fifty-seven".