6165161521 has 2 divisors, whose sum is σ = 6165161522. Its totient is φ = 6165161520.

The previous prime is 6165161479. The next prime is 6165161557. The reversal of 6165161521 is 1251615616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5892251121 + 272910400 = 76761^2 + 16520^2 .

It is a cyclic number.

It is not a de Polignac number, because 6165161521 - 2⁷ = 6165161393 is a prime.

It is not a weakly prime, because it can be changed into another prime (6165161581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3082580760 + 3082580761.

It is an arithmetic number, because the mean of its divisors is an integer number (3082580761).

Almost surely, 2^6165161521 is an apocalyptic number.

It is an amenable number.

6165161521 is a deficient number, since it is larger than the sum of its proper divisors (1).

6165161521 is an equidigital number, since it uses as much as digits as its factorization.

6165161521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 34.

The square root of 6165161521 is about 78518.5425297745. The cubic root of 6165161521 is about 1833.6431471533.

The spelling of 6165161521 in words is "six billion, one hundred sixty-five million, one hundred sixty-one thousand, five hundred twenty-one".