165111661013 has 12 divisors (see below), whose sum is σ = 180197365248. Its totient is φ = 151210659600.

The previous prime is 165111661007. The next prime is 165111661019. The reversal of 165111661013 is 310166111561.

It is an interprime number because it is at equal distance from previous prime (165111661007) and next prime (165111661019).

It is not a de Polignac number, because 165111661013 - 2¹⁶ = 165111595477 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165111661019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3824963 + ... + 3867888.

It is an arithmetic number, because the mean of its divisors is an integer number (15016447104).

Almost surely, 2^165111661013 is an apocalyptic number.

165111661013 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

165111661013 is a deficient number, since it is larger than the sum of its proper divisors (15085704235).

165111661013 is a wasteful number, since it uses less digits than its factorization.

165111661013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7693004 (or 7692991 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 32.

Adding to 165111661013 its reverse (310166111561), we get a palindrome (475277772574).

The spelling of 165111661013 in words is "one hundred sixty-five billion, one hundred eleven million, six hundred sixty-one thousand, thirteen".