18532861536 has 144 divisors (see below), whose sum is σ = 57308912640. Its totient is φ = 5227971840.

The previous prime is 18532861493. The next prime is 18532861561. The reversal of 18532861536 is 63516823581.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 346681 + ... + 396551.

It is an arithmetic number, because the mean of its divisors is an integer number (397978560).

Almost surely, 2^18532861536 is an apocalyptic number.

18532861536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18532861536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28654456320).

18532861536 is an abundant number, since it is smaller than the sum of its proper divisors (38776051104).

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

18532861536 is a wasteful number, since it uses less digits than its factorization.

18532861536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49977 (or 49962 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 48.

The spelling of 18532861536 in words is "eighteen billion, five hundred thirty-two million, eight hundred sixty-one thousand, five hundred thirty-six".