18516436145 has 8 divisors (see below), whose sum is σ = 22221608040. Its totient is φ = 14811892480.

The previous prime is 18516436129. The next prime is 18516436153. The reversal of 18516436145 is 54163461581.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2147024896 + 16369411249 = 46336^2 + 127943^2 .

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

It is not a de Polignac number, because 18516436145 - 2⁴ = 18516436129 is a prime.

It is a super-2 number, since 2×18516436145² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18516436096 and 18516436105.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89576 + ... + 212265.

It is an arithmetic number, because the mean of its divisors is an integer number (2777701005).

Almost surely, 2^18516436145 is an apocalyptic number.

It is an amenable number.

18516436145 is a deficient number, since it is larger than the sum of its proper divisors (3705171895).

18516436145 is a wasteful number, since it uses less digits than its factorization.

18516436145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314115.

The product of its digits is 345600, while the sum is 44.

The spelling of 18516436145 in words is "eighteen billion, five hundred sixteen million, four hundred thirty-six thousand, one hundred forty-five".