18040411681 has 8 divisors (see below), whose sum is σ = 18482237928. Its totient is φ = 17598672000.

The previous prime is 18040411663. The next prime is 18040411687. The reversal of 18040411681 is 18611404081.

It can be written as a sum of positive squares in 4 ways, for example, as 5536699281 + 12503712400 = 74409^2 + 111820^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18040411681 - 2¹¹ = 18040409633 is a prime.

It is a super-2 number, since 2×18040411681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18040411687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 658191 + ... + 685051.

It is an arithmetic number, because the mean of its divisors is an integer number (2310279741).

Almost surely, 2^18040411681 is an apocalyptic number.

It is an amenable number.

18040411681 is a deficient number, since it is larger than the sum of its proper divisors (441826247).

18040411681 is a wasteful number, since it uses less digits than its factorization.

18040411681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43283.

The product of its (nonzero) digits is 6144, while the sum is 34.

The spelling of 18040411681 in words is "eighteen billion, forty million, four hundred eleven thousand, six hundred eighty-one".