18578221538387 has 8 divisors (see below), whose sum is σ = 21233303462400. Its totient is φ = 15923402183304.

The previous prime is 18578221538363. The next prime is 18578221538413. The reversal of 18578221538387 is 78383512287581.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18578221538387 - 2²⁰ = 18578220489811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18578221538587) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65490587 + ... + 65773652.

It is an arithmetic number, because the mean of its divisors is an integer number (2654162932800).

Almost surely, 2^{18578221538387} is an apocalyptic number.

18578221538387 is a deficient number, since it is larger than the sum of its proper divisors (2655081924013).

18578221538387 is a wasteful number, since it uses less digits than its factorization.

18578221538387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131284465.

The product of its digits is 180633600, while the sum is 68.

The spelling of 18578221538387 in words is "eighteen trillion, five hundred seventy-eight billion, two hundred twenty-one million, five hundred thirty-eight thousand, three hundred eighty-seven".