18693430686 has 24 divisors (see below), whose sum is σ = 46288495344. Its totient is φ = 5340980160.

The previous prime is 18693430669. The next prime is 18693430727. The reversal of 18693430686 is 68603439681.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 74180155 + ... + 74180406.

It is an arithmetic number, because the mean of its divisors is an integer number (1928687306).

Almost surely, 2^18693430686 is an apocalyptic number.

18693430686 is an abundant number, since it is smaller than the sum of its proper divisors (27595064658).

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

18693430686 is a wasteful number, since it uses less digits than its factorization.

18693430686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148360576 (or 148360573 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 54.

The spelling of 18693430686 in words is "eighteen billion, six hundred ninety-three million, four hundred thirty thousand, six hundred eighty-six".