18366868517 has 8 divisors (see below), whose sum is σ = 18766444824. Its totient is φ = 17969256448.

The previous prime is 18366868469. The next prime is 18366868543. The reversal of 18366868517 is 71586866381.

It can be written as a sum of positive squares in 4 ways, for example, as 132687361 + 18234181156 = 11519^2 + 135034^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18366868517 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 (18366868217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 472148 + ... + 509565.

It is an arithmetic number, because the mean of its divisors is an integer number (2345805603).

Almost surely, 2^18366868517 is an apocalyptic number.

It is an amenable number.

18366868517 is a deficient number, since it is larger than the sum of its proper divisors (399576307).

18366868517 is an equidigital number, since it uses as much as digits as its factorization.

18366868517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 982119.

The product of its digits is 11612160, while the sum is 59.

The spelling of 18366868517 in words is "eighteen billion, three hundred sixty-six million, eight hundred sixty-eight thousand, five hundred seventeen".