18696679530817 has 4 divisors (see below), whose sum is σ = 18696854319300. Its totient is φ = 18696504742336.

The previous prime is 18696679530791. The next prime is 18696679530937. The reversal of 18696679530817 is 71803597669681.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17569166850481 + 1127512680336 = 4191559^2 + 1061844^2 .

It is a cyclic number.

It is not a de Polignac number, because 18696679530817 - 2¹⁹ = 18696679006529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18696679530517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87233692 + ... + 87447757.

It is an arithmetic number, because the mean of its divisors is an integer number (4674213579825).

Almost surely, 2^{18696679530817} is an apocalyptic number.

It is an amenable number.

18696679530817 is a deficient number, since it is larger than the sum of its proper divisors (174788483).

18696679530817 is a wasteful number, since it uses less digits than its factorization.

18696679530817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174788482.

The product of its (nonzero) digits is 823011840, while the sum is 76.

The spelling of 18696679530817 in words is "eighteen trillion, six hundred ninety-six billion, six hundred seventy-nine million, five hundred thirty thousand, eight hundred seventeen".