18117216435541 has 8 divisors (see below), whose sum is σ = 18120087751680. Its totient is φ = 18114345337008.

The previous prime is 18117216435529. The next prime is 18117216435547. The reversal of 18117216435541 is 14553461271181.

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 18117216435541 - 2²¹ = 18117214338389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18117216435547) 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, 248939340 + ... + 249012106.

It is an arithmetic number, because the mean of its divisors is an integer number (2265010968960).

Almost surely, 2^{18117216435541} is an apocalyptic number.

It is an amenable number.

18117216435541 is a deficient number, since it is larger than the sum of its proper divisors (2871316139).

18117216435541 is an equidigital number, since it uses as much as digits as its factorization.

18117216435541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108803.

The product of its digits is 806400, while the sum is 49.

The spelling of 18117216435541 in words is "eighteen trillion, one hundred seventeen billion, two hundred sixteen million, four hundred thirty-five thousand, five hundred forty-one".