18124745856 has 128 divisors (see below), whose sum is σ = 55685145600. Its totient is φ = 5116044288.

The previous prime is 18124745803. The next prime is 18124745869. The reversal of 18124745856 is 65854742181.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a junction number, because it is equal to n+sod(n) for n = 18124745799 and 18124745808.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 182485 + ... + 263723.

It is an arithmetic number, because the mean of its divisors is an integer number (435040200).

Almost surely, 2^18124745856 is an apocalyptic number.

18124745856 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 18124745856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27842572800).

18124745856 is an abundant number, since it is smaller than the sum of its proper divisors (37560399744).

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

18124745856 is an equidigital number, since it uses as much as digits as its factorization.

18124745856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81346 (or 81334 counting only the distinct ones).

The product of its digits is 2150400, while the sum is 51.

The spelling of 18124745856 in words is "eighteen billion, one hundred twenty-four million, seven hundred forty-five thousand, eight hundred fifty-six".