18117216435542 has 16 divisors (see below), whose sum is σ = 31087692669600. Its totient is φ = 7757119491648.

The previous prime is 18117216435529. The next prime is 18117216435547. The reversal of 18117216435542 is 24553461271181.

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, 616804613 + ... + 616833984.

It is an arithmetic number, because the mean of its divisors is an integer number (1942980791850).

Almost surely, 2^{18117216435542} is an apocalyptic number.

18117216435542 is a deficient number, since it is larger than the sum of its proper divisors (12970476234058).

18117216435542 is a wasteful number, since it uses less digits than its factorization.

18117216435542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1233639655.

The product of its digits is 1612800, while the sum is 50.

The spelling of 18117216435542 in words is "eighteen trillion, one hundred seventeen billion, two hundred sixteen million, four hundred thirty-five thousand, five hundred forty-two".