18721835166799 has 8 divisors (see below), whose sum is σ = 19910361872240. Its totient is φ = 17553625157376.

The previous prime is 18721835166791. The next prime is 18721835166803. The reversal of 18721835166799 is 99766153812781.

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

It is not a de Polignac number, because 18721835166799 - 2³ = 18721835166791 is a prime.

It is a super-2 number, since 2×18721835166799² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18721835166791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5079172104 + ... + 5079175789.

It is an arithmetic number, because the mean of its divisors is an integer number (2488795234030).

Almost surely, 2^{18721835166799} is an apocalyptic number.

18721835166799 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

18721835166799 is a deficient number, since it is larger than the sum of its proper divisors (1188526705441).

18721835166799 is a wasteful number, since it uses less digits than its factorization.

18721835166799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10158348009.

The product of its digits is 274337280, while the sum is 73.

The spelling of 18721835166799 in words is "eighteen trillion, seven hundred twenty-one billion, eight hundred thirty-five million, one hundred sixty-six thousand, seven hundred ninety-nine".