18540111629 has 8 divisors (see below), whose sum is σ = 20190615480. Its totient is φ = 16921656576.

The previous prime is 18540111619. The next prime is 18540111659. The reversal of 18540111629 is 92611104581.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 998433604 + 17541678025 = 31598^2 + 132445^2 .

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 18540111629 - 2⁴ = 18540111613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18540111592 and 18540111601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18540111619) 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, 8010992 + ... + 8013305.

It is an arithmetic number, because the mean of its divisors is an integer number (2523826935).

Almost surely, 2^18540111629 is an apocalyptic number.

It is an amenable number.

18540111629 is a deficient number, since it is larger than the sum of its proper divisors (1650503851).

18540111629 is a wasteful number, since it uses less digits than its factorization.

18540111629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16024399.

The product of its (nonzero) digits is 17280, while the sum is 38.

The spelling of 18540111629 in words is "eighteen billion, five hundred forty million, one hundred eleven thousand, six hundred twenty-nine".