18535811896 has 64 divisors (see below), whose sum is σ = 41030369280. Its totient is φ = 7682135040.

The previous prime is 18535811891. The next prime is 18535811897. The reversal of 18535811896 is 69811853581.

18535811896 = 9134² + 9135² + ... + 9350².

It is a super-2 number, since 2×18535811896² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18535811891) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 3161800 + ... + 3167656.

It is an arithmetic number, because the mean of its divisors is an integer number (641099520).

Almost surely, 2^18535811896 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 18535811896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20515184640).

18535811896 is an abundant number, since it is smaller than the sum of its proper divisors (22494557384).

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

18535811896 is a wasteful number, since it uses less digits than its factorization.

18535811896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7724 (or 7720 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 55.

The spelling of 18535811896 in words is "eighteen billion, five hundred thirty-five million, eight hundred eleven thousand, eight hundred ninety-six".