18338962840685 has 4 divisors (see below), whose sum is σ = 22006755408828. Its totient is φ = 14671170272544.

The previous prime is 18338962840619. The next prime is 18338962840711. The reversal of 18338962840685 is 58604826983381.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7815932898601 + 10523029942084 = 2795699^2 + 3243922^2 .

It is a cyclic number.

It is not a de Polignac number, because 18338962840685 - 2³⁴ = 18321782971501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1833896284064 + ... + 1833896284073.

It is an arithmetic number, because the mean of its divisors is an integer number (5501688852207).

Almost surely, 2^{18338962840685} is an apocalyptic number.

It is an amenable number.

18338962840685 is a deficient number, since it is larger than the sum of its proper divisors (3667792568143).

18338962840685 is an equidigital number, since it uses as much as digits as its factorization.

18338962840685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3667792568142.

The product of its (nonzero) digits is 477757440, while the sum is 71.

The spelling of 18338962840685 in words is "eighteen trillion, three hundred thirty-eight billion, nine hundred sixty-two million, eight hundred forty thousand, six hundred eighty-five".