18643702478328 has 48 divisors (see below), whose sum is σ = 50494443035400. Its totient is φ = 6214434304320.

The previous prime is 18643702478293. The next prime is 18643702478329. The reversal of 18643702478328 is 82387420734681.

18643702478328 is a `hidden beast` number, since 1 + 8 + 64 + 3 + 7 + 0 + 247 + 8 + 328 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18643702478329) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 637018 + ... + 6139478.

Almost surely, 2^{18643702478328} is an apocalyptic number.

18643702478328 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18643702478328 is an abundant number, since it is smaller than the sum of its proper divisors (31850740557072).

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

18643702478328 is a wasteful number, since it uses less digits than its factorization.

18643702478328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5549532 (or 5549525 counting only the distinct ones).

The product of its (nonzero) digits is 86704128, while the sum is 63.

The spelling of 18643702478328 in words is "eighteen trillion, six hundred forty-three billion, seven hundred two million, four hundred seventy-eight thousand, three hundred twenty-eight".