18693909607 has 4 divisors (see below), whose sum is σ = 18694734120. Its totient is φ = 18693085096.

The previous prime is 18693909589. The next prime is 18693909629. The reversal of 18693909607 is 70690939681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70690939681 = 113 ⋅625583537.

It is a cyclic number.

It is not a de Polignac number, because 18693909607 - 2¹¹ = 18693907559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18693909007) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 377257 + ... + 423922.

It is an arithmetic number, because the mean of its divisors is an integer number (4673683530).

Almost surely, 2^18693909607 is an apocalyptic number.

18693909607 is a deficient number, since it is larger than the sum of its proper divisors (824513).

18693909607 is an equidigital number, since it uses as much as digits as its factorization.

18693909607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 824512.

The product of its (nonzero) digits is 4408992, while the sum is 58.

The spelling of 18693909607 in words is "eighteen billion, six hundred ninety-three million, nine hundred nine thousand, six hundred seven".