18355518353855 has 32 divisors (see below), whose sum is σ = 23005337472000. Its totient is φ = 14033111000832.

The previous prime is 18355518353827. The next prime is 18355518353891. The reversal of 18355518353855 is 55835381555381.

It is a cyclic number.

It is not a de Polignac number, because 18355518353855 - 2²² = 18355514159551 is a prime.

It is a super-2 number, since 2×18355518353855² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18355518353791 and 18355518353800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 973293416 + ... + 973312274.

It is an arithmetic number, because the mean of its divisors is an integer number (718916796000).

Almost surely, 2^{18355518353855} is an apocalyptic number.

18355518353855 is a deficient number, since it is larger than the sum of its proper divisors (4649819118145).

18355518353855 is a wasteful number, since it uses less digits than its factorization.

18355518353855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26183.

The product of its digits is 216000000, while the sum is 65.

The spelling of 18355518353855 in words is "eighteen trillion, three hundred fifty-five billion, five hundred eighteen million, three hundred fifty-three thousand, eight hundred fifty-five".