18128038656 has 144 divisors (see below), whose sum is σ = 59381176064. Its totient is φ = 4781002752.

The previous prime is 18128038637. The next prime is 18128038657. The reversal of 18128038656 is 65683082181.

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

It is not an unprimeable number, because it can be changed into a prime (18128038657) 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, 59806 + ... + 199581.

Almost surely, 2^18128038656 is an apocalyptic number.

18128038656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18128038656 is an abundant number, since it is smaller than the sum of its proper divisors (41253137408).

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

18128038656 is a wasteful number, since it uses less digits than its factorization.

18128038656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259426 (or 259412 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 48.

The spelling of 18128038656 in words is "eighteen billion, one hundred twenty-eight million, thirty-eight thousand, six hundred fifty-six".