18539339386385 has 8 divisors (see below), whose sum is σ = 22252759373376. Its totient is φ = 14827770102640.

The previous prime is 18539339386361. The next prime is 18539339386409. The reversal of 18539339386385 is 58368393393581.

It is an interprime number because it is at equal distance from previous prime (18539339386361) and next prime (18539339386409).

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

It is not a de Polignac number, because 18539339386385 - 2³⁶ = 18470619909649 is a prime.

It is a super-2 number, since 2×18539339386385² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 462653771 + ... + 462693840.

It is an arithmetic number, because the mean of its divisors is an integer number (2781594921672).

Almost surely, 2^{18539339386385} is an apocalyptic number.

It is an amenable number.

18539339386385 is a deficient number, since it is larger than the sum of its proper divisors (3713419986991).

18539339386385 is an equidigital number, since it uses as much as digits as its factorization.

18539339386385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 925351623.

The product of its digits is 1511654400, while the sum is 74.

The spelling of 18539339386385 in words is "eighteen trillion, five hundred thirty-nine billion, three hundred thirty-nine million, three hundred eighty-six thousand, three hundred eighty-five".