18751687868 has 12 divisors (see below), whose sum is σ = 32825508912. Its totient is φ = 9372971040.

The previous prime is 18751687861. The next prime is 18751687873. The reversal of 18751687868 is 86878615781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18751687861) 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, 703505 + ... + 729672.

It is an arithmetic number, because the mean of its divisors is an integer number (2735459076).

Almost surely, 2^18751687868 is an apocalyptic number.

It is an amenable number.

18751687868 is a deficient number, since it is larger than the sum of its proper divisors (14073821044).

18751687868 is a wasteful number, since it uses less digits than its factorization.

18751687868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1436452 (or 1436450 counting only the distinct ones).

The product of its digits is 36126720, while the sum is 65.

The spelling of 18751687868 in words is "eighteen billion, seven hundred fifty-one million, six hundred eighty-seven thousand, eight hundred sixty-eight".