18866730747768 has 64 divisors (see below), whose sum is σ = 48180108303360. Its totient is φ = 6153860125056.

The previous prime is 18866730747703. The next prime is 18866730747769. The reversal of 18866730747768 is 86774703766881.

It is a junction number, because it is equal to n+sod(n) for n = 18866730747693 and 18866730747702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18866730747769) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3904405 + ... + 7278587.

It is an arithmetic number, because the mean of its divisors is an integer number (752814192240).

Almost surely, 2^{18866730747768} is an apocalyptic number.

It is an amenable number.

18866730747768 is an abundant number, since it is smaller than the sum of its proper divisors (29313377555592).

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

18866730747768 is a wasteful number, since it uses less digits than its factorization.

18866730747768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3379196 (or 3379192 counting only the distinct ones).

The product of its (nonzero) digits is 3186376704, while the sum is 78.

The spelling of 18866730747768 in words is "eighteen trillion, eight hundred sixty-six billion, seven hundred thirty million, seven hundred forty-seven thousand, seven hundred sixty-eight".