18764128088639 has 4 divisors (see below), whose sum is σ = 18794539966224. Its totient is φ = 18733716211056.

The previous prime is 18764128088627. The next prime is 18764128088669. The reversal of 18764128088639 is 93688082146781.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18764128088639 - 2⁴ = 18764128088623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18764128088669) 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, 15205937867 + ... + 15205939100.

It is an arithmetic number, because the mean of its divisors is an integer number (4698634991556).

Almost surely, 2^{18764128088639} is an apocalyptic number.

18764128088639 is a deficient number, since it is larger than the sum of its proper divisors (30411877585).

18764128088639 is an equidigital number, since it uses as much as digits as its factorization.

18764128088639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30411877584.

The product of its (nonzero) digits is 222953472, while the sum is 71.

The spelling of 18764128088639 in words is "eighteen trillion, seven hundred sixty-four billion, one hundred twenty-eight million, eighty-eight thousand, six hundred thirty-nine".