18165505139563 has 8 divisors (see below), whose sum is σ = 18326466720000. Its totient is φ = 18004547154048.

The previous prime is 18165505139503. The next prime is 18165505139581. The reversal of 18165505139563 is 36593150556181.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 18165505139563 - 2¹⁷ = 18165505008491 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18165505139498 and 18165505139507.

It is not an unprimeable number, because it can be changed into a prime (18165505139503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9815613 + ... + 11518561.

It is an arithmetic number, because the mean of its divisors is an integer number (2290808340000).

Almost surely, 2^{18165505139563} is an apocalyptic number.

18165505139563 is a deficient number, since it is larger than the sum of its proper divisors (160961580437).

18165505139563 is a wasteful number, since it uses less digits than its factorization.

18165505139563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1797461.

The product of its (nonzero) digits is 14580000, while the sum is 58.

The spelling of 18165505139563 in words is "eighteen trillion, one hundred sixty-five billion, five hundred five million, one hundred thirty-nine thousand, five hundred sixty-three".