18686417260871 has 32 divisors (see below), whose sum is σ = 19933769157120. Its totient is φ = 17466877584000.

The previous prime is 18686417260859. The next prime is 18686417260873. The reversal of 18686417260871 is 17806271468681.

It is a cyclic number.

It is not a de Polignac number, because 18686417260871 - 2¹⁸ = 18686416998727 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18686417260798 and 18686417260807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18686417260873) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 822562805 + ... + 822585521.

It is an arithmetic number, because the mean of its divisors is an integer number (622930286160).

Almost surely, 2^{18686417260871} is an apocalyptic number.

18686417260871 is a deficient number, since it is larger than the sum of its proper divisors (1247351896249).

18686417260871 is a wasteful number, since it uses less digits than its factorization.

18686417260871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24455.

The product of its (nonzero) digits is 43352064, while the sum is 65.

The spelling of 18686417260871 in words is "eighteen trillion, six hundred eighty-six billion, four hundred seventeen million, two hundred sixty thousand, eight hundred seventy-one".