18798311797 has 8 divisors (see below), whose sum is σ = 19308960216. Its totient is φ = 18287799552.

The previous prime is 18798311771. The next prime is 18798311803. The reversal of 18798311797 is 79711389781.

It can be written as a sum of positive squares in 4 ways, for example, as 3543344676 + 15254967121 = 59526^2 + 123511^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18798311797 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 (18798311717) 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, 286113 + ... + 345625.

It is an arithmetic number, because the mean of its divisors is an integer number (2413620027).

Almost surely, 2^18798311797 is an apocalyptic number.

It is an amenable number.

18798311797 is a deficient number, since it is larger than the sum of its proper divisors (510648419).

18798311797 is an equidigital number, since it uses as much as digits as its factorization.

18798311797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68087.

The product of its digits is 5334336, while the sum is 61.

The spelling of 18798311797 in words is "eighteen billion, seven hundred ninety-eight million, three hundred eleven thousand, seven hundred ninety-seven".