18688793720787 has 12 divisors (see below), whose sum is σ = 27115977738304. Its totient is φ = 12403324979280.

The previous prime is 18688793720777. The next prime is 18688793720801. The reversal of 18688793720787 is 78702739788681.

It is not a de Polignac number, because 18688793720787 - 2³⁵ = 18654433982419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18688793720777) 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, 4655900764 + ... + 4655904777.

Almost surely, 2^{18688793720787} is an apocalyptic number.

18688793720787 is a deficient number, since it is larger than the sum of its proper divisors (8427184017517).

18688793720787 is a wasteful number, since it uses less digits than its factorization.

18688793720787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9311805770 (or 9311805767 counting only the distinct ones).

The product of its (nonzero) digits is 3186376704, while the sum is 81.

The spelling of 18688793720787 in words is "eighteen trillion, six hundred eighty-eight billion, seven hundred ninety-three million, seven hundred twenty thousand, seven hundred eighty-seven".