515665161 has 12 divisors (see below), whose sum is σ = 812563440. Its totient is φ = 312524280.

The previous prime is 515665141. The next prime is 515665181. The reversal of 515665161 is 161566515.

It is an interprime number because it is at equal distance from previous prime (515665141) and next prime (515665181).

It is not a de Polignac number, because 515665161 - 2¹³ = 515656969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (515665121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2604271 + ... + 2604468.

It is an arithmetic number, because the mean of its divisors is an integer number (67713620).

Almost surely, 2^515665161 is an apocalyptic number.

It is an amenable number.

515665161 is a deficient number, since it is larger than the sum of its proper divisors (296898279).

515665161 is a wasteful number, since it uses less digits than its factorization.

515665161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5208756 (or 5208753 counting only the distinct ones).

The product of its digits is 27000, while the sum is 36.

The square root of 515665161 is about 22708.2619546279. The cubic root of 515665161 is about 801.9044009946.

The spelling of 515665161 in words is "five hundred fifteen million, six hundred sixty-five thousand, one hundred sixty-one".