18678537686 has 4 divisors (see below), whose sum is σ = 28017806532. Its totient is φ = 9339268842.

The previous prime is 18678537673. The next prime is 18678537697. The reversal of 18678537686 is 68673587681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68673587681 = 41611 ⋅1650371.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4669634420 + ... + 4669634423.

It is an arithmetic number, because the mean of its divisors is an integer number (7004451633).

Almost surely, 2^18678537686 is an apocalyptic number.

18678537686 is a deficient number, since it is larger than the sum of its proper divisors (9339268846).

18678537686 is an equidigital number, since it uses as much as digits as its factorization.

18678537686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9339268845.

The product of its digits is 81285120, while the sum is 65.

The spelling of 18678537686 in words is "eighteen billion, six hundred seventy-eight million, five hundred thirty-seven thousand, six hundred eighty-six".