6165161557 has 2 divisors, whose sum is σ = 6165161558. Its totient is φ = 6165161556.

The previous prime is 6165161521. The next prime is 6165161573. The reversal of 6165161557 is 7551615616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5493626161 + 671535396 = 74119^2 + 25914^2 .

It is a cyclic number.

It is not a de Polignac number, because 6165161557 - 2¹¹ = 6165159509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6165165557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3082580778 + 3082580779.

It is an arithmetic number, because the mean of its divisors is an integer number (3082580779).

Almost surely, 2^6165161557 is an apocalyptic number.

It is an amenable number.

6165161557 is a deficient number, since it is larger than the sum of its proper divisors (1).

6165161557 is an equidigital number, since it uses as much as digits as its factorization.

6165161557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 189000, while the sum is 43.

The square root of 6165161557 is about 78518.5427590197. The cubic root of 6165161557 is about 1833.6431507223.

The spelling of 6165161557 in words is "six billion, one hundred sixty-five million, one hundred sixty-one thousand, five hundred fifty-seven".