18156428544 has 72 divisors (see below), whose sum is σ = 48393923872. Its totient is φ = 6043207680.

The previous prime is 18156428539. The next prime is 18156428581. The reversal of 18156428544 is 44582465181.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

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

It is a junction number, because it is equal to n+sod(n) for n = 18156428493 and 18156428502.

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 7 ways as a sum of consecutive naturals, for example, 513582 + ... + 547794.

Almost surely, 2^18156428544 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 18156428544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24196961936).

18156428544 is an abundant number, since it is smaller than the sum of its proper divisors (30237495328).

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

18156428544 is an equidigital number, since it uses as much as digits as its factorization.

18156428544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34923 (or 34909 counting only the distinct ones).

The product of its digits is 1228800, while the sum is 48.

The spelling of 18156428544 in words is "eighteen billion, one hundred fifty-six million, four hundred twenty-eight thousand, five hundred forty-four".