18163128661816 has 32 divisors (see below), whose sum is σ = 36067126109040. Its totient is φ = 8545464621568.

The previous prime is 18163128661781. The next prime is 18163128661879. The reversal of 18163128661816 is 61816682136181.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14148571 + ... + 15378826.

Almost surely, 2^{18163128661816} is an apocalyptic number.

It is an amenable number.

18163128661816 is a deficient number, since it is larger than the sum of its proper divisors (17903997447224).

18163128661816 is a wasteful number, since it uses less digits than its factorization.

18163128661816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29531943 (or 29531939 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 58.

The spelling of 18163128661816 in words is "eighteen trillion, one hundred sixty-three billion, one hundred twenty-eight million, six hundred sixty-one thousand, eight hundred sixteen".