18336850185557 has 4 divisors (see below), whose sum is σ = 18336859790880. Its totient is φ = 18336840580236.

The previous prime is 18336850185529. The next prime is 18336850185559. The reversal of 18336850185557 is 75558105863381.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18336850185557 - 2¹⁶ = 18336850120021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18336850185493 and 18336850185502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18336850185559) 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, 860507 + ... + 6116712.

It is an arithmetic number, because the mean of its divisors is an integer number (4584214947720).

Almost surely, 2^{18336850185557} is an apocalyptic number.

It is an amenable number.

18336850185557 is a deficient number, since it is larger than the sum of its proper divisors (9605323).

18336850185557 is an equidigital number, since it uses as much as digits as its factorization.

18336850185557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9605322.

The product of its (nonzero) digits is 120960000, while the sum is 65.

The spelling of 18336850185557 in words is "eighteen trillion, three hundred thirty-six billion, eight hundred fifty million, one hundred eighty-five thousand, five hundred fifty-seven".