18398344536 has 336 divisors, whose sum is σ = 61133807160. Its totient is φ = 5143357440.

The previous prime is 18398344493. The next prime is 18398344553. The reversal of 18398344536 is 63544389381.

18398344536 is a `hidden beast` number, since 1 + 83 + 98 + 3 + 445 + 36 = 666.

It is a super-2 number, since 2×18398344536² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 10840840 + ... + 10842536.

Almost surely, 2^18398344536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18398344536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30566903580).

18398344536 is an abundant number, since it is smaller than the sum of its proper divisors (42735462624).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18398344536 is a wasteful number, since it uses less digits than its factorization.

18398344536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1758 (or 1726 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 54.

The spelling of 18398344536 in words is "eighteen billion, three hundred ninety-eight million, three hundred forty-four thousand, five hundred thirty-six".