18688377788 has 24 divisors (see below), whose sum is σ = 32764192608. Its totient is φ = 9327200256.

The previous prime is 18688377781. The next prime is 18688377793. The reversal of 18688377788 is 88777388681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18688377781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8843420 + ... + 8845532.

It is an arithmetic number, because the mean of its divisors is an integer number (1365174692).

Almost surely, 2^18688377788 is an apocalyptic number.

It is an amenable number.

18688377788 is a deficient number, since it is larger than the sum of its proper divisors (14075814820).

18688377788 is a wasteful number, since it uses less digits than its factorization.

18688377788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5093 (or 5091 counting only the distinct ones).

The product of its digits is 202309632, while the sum is 71.

The spelling of 18688377788 in words is "eighteen billion, six hundred eighty-eight million, three hundred seventy-seven thousand, seven hundred eighty-eight".