515501611161 has 16 divisors (see below), whose sum is σ = 709562101248. Its totient is φ = 332556134400.

The previous prime is 515501611159. The next prime is 515501611201. The reversal of 515501611161 is 161116105515.

It is not a de Polignac number, because 515501611161 - 2¹ = 515501611159 is a prime.

It is a super-2 number, since 2×515501611161² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (515501611661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1043815 + ... + 1456211.

It is an arithmetic number, because the mean of its divisors is an integer number (44347631328).

Almost surely, 2^515501611161 is an apocalyptic number.

It is an amenable number.

515501611161 is a deficient number, since it is larger than the sum of its proper divisors (194060490087).

515501611161 is a wasteful number, since it uses less digits than its factorization.

515501611161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425872.

The product of its (nonzero) digits is 4500, while the sum is 33.

Adding to 515501611161 its reverse (161116105515), we get a palindrome (676617716676).

The spelling of 515501611161 in words is "five hundred fifteen billion, five hundred one million, six hundred eleven thousand, one hundred sixty-one".