6165665557 has 2 divisors, whose sum is σ = 6165665558. Its totient is φ = 6165665556.

The previous prime is 6165665497. The next prime is 6165665659. The reversal of 6165665557 is 7555665616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5977454596 + 188210961 = 77314^2 + 13719^2 .

It is a cyclic number.

It is not a de Polignac number, because 6165665557 - 2¹¹ = 6165663509 is a prime.

It is a super-2 number, since 2×6165665557² = 76030863521552240498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6165662557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3082832778 + 3082832779.

It is an arithmetic number, because the mean of its divisors is an integer number (3082832779).

Almost surely, 2^6165665557 is an apocalyptic number.

It is an amenable number.

6165665557 is a deficient number, since it is larger than the sum of its proper divisors (1).

6165665557 is an equidigital number, since it uses as much as digits as its factorization.

6165665557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5670000, while the sum is 52.

The square root of 6165665557 is about 78521.7521264013. The cubic root of 6165665557 is about 1833.6931159426.

The spelling of 6165665557 in words is "six billion, one hundred sixty-five million, six hundred sixty-five thousand, five hundred fifty-seven".