18707689819 has 16 divisors (see below), whose sum is σ = 23349150720. Its totient is φ = 14593209120.

The previous prime is 18707689811. The next prime is 18707689823. The reversal of 18707689819 is 91898670781.

It is a happy number.

It is not a de Polignac number, because 18707689819 - 2³ = 18707689811 is a prime.

It is a super-2 number, since 2×18707689819² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18707689811) 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, 1441279 + ... + 1454200.

It is an arithmetic number, because the mean of its divisors is an integer number (1459321920).

Almost surely, 2^18707689819 is an apocalyptic number.

18707689819 is a deficient number, since it is larger than the sum of its proper divisors (4641460901).

18707689819 is a wasteful number, since it uses less digits than its factorization.

18707689819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2895570.

The product of its (nonzero) digits is 12192768, while the sum is 64.

The spelling of 18707689819 in words is "eighteen billion, seven hundred seven million, six hundred eighty-nine thousand, eight hundred nineteen".