18986128943538 has 8 divisors (see below), whose sum is σ = 37972257887088. Its totient is φ = 6328709647844.

The previous prime is 18986128943473. The next prime is 18986128943539. The reversal of 18986128943538 is 83534982168981.

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

18986128943538 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 18986128943538.

It is not an unprimeable number, because it can be changed into a prime (18986128943539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1582177411956 + ... + 1582177411967.

It is an arithmetic number, because the mean of its divisors is an integer number (4746532235886).

Almost surely, 2^{18986128943538} is an apocalyptic number.

18986128943538 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18986128943538 is a wasteful number, since it uses less digits than its factorization.

18986128943538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3164354823928.

The product of its digits is 716636160, while the sum is 75.

The spelling of 18986128943538 in words is "eighteen trillion, nine hundred eighty-six billion, one hundred twenty-eight million, nine hundred forty-three thousand, five hundred thirty-eight".