18339458387761 has 4 divisors (see below), whose sum is σ = 20959381014592. Its totient is φ = 15719535760932.

The previous prime is 18339458387737. The next prime is 18339458387779. The reversal of 18339458387761 is 16778385493381.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18339458387761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18339458387561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1309961313405 + ... + 1309961313418.

It is an arithmetic number, because the mean of its divisors is an integer number (5239845253648).

Almost surely, 2^{18339458387761} is an apocalyptic number.

It is an amenable number.

18339458387761 is a deficient number, since it is larger than the sum of its proper divisors (2619922626831).

18339458387761 is an equidigital number, since it uses as much as digits as its factorization.

18339458387761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2619922626830.

The product of its digits is 731566080, while the sum is 73.

The spelling of 18339458387761 in words is "eighteen trillion, three hundred thirty-nine billion, four hundred fifty-eight million, three hundred eighty-seven thousand, seven hundred sixty-one".