18717357017 has 8 divisors (see below), whose sum is σ = 19830724200. Its totient is φ = 17605361664.

The previous prime is 18717356923. The next prime is 18717357019. The reversal of 18717357017 is 71075371781.

It can be written as a sum of positive squares in 4 ways, for example, as 6212750041 + 12504606976 = 78821^2 + 111824^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 18717357017 - 2⁸ = 18717356761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18717357019) 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, 314792 + ... + 369497.

It is an arithmetic number, because the mean of its divisors is an integer number (2478840525).

Almost surely, 2^18717357017 is an apocalyptic number.

18717357017 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18717357017 is a deficient number, since it is larger than the sum of its proper divisors (1113367183).

18717357017 is a wasteful number, since it uses less digits than its factorization.

18717357017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685915.

The product of its (nonzero) digits is 288120, while the sum is 47.

The spelling of 18717357017 in words is "eighteen billion, seven hundred seventeen million, three hundred fifty-seven thousand, seventeen".