16665181131 has 16 divisors (see below), whose sum is σ = 22538649600. Its totient is φ = 10950992640.

The previous prime is 16665181129. The next prime is 16665181133. The reversal of 16665181131 is 13118156661.

It is an interprime number because it is at equal distance from previous prime (16665181129) and next prime (16665181133).

It is not a de Polignac number, because 16665181131 - 2¹ = 16665181129 is a prime.

It is a super-2 number, since 2×16665181131² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16665181131.

It is not an unprimeable number, because it can be changed into a prime (16665181133) 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, 1295670 + ... + 1308468.

It is an arithmetic number, because the mean of its divisors is an integer number (1408665600).

Almost surely, 2^16665181131 is an apocalyptic number.

16665181131 is a deficient number, since it is larger than the sum of its proper divisors (5873468469).

16665181131 is a wasteful number, since it uses less digits than its factorization.

16665181131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18986.

The product of its digits is 25920, while the sum is 39.

The spelling of 16665181131 in words is "sixteen billion, six hundred sixty-five million, one hundred eighty-one thousand, one hundred thirty-one".