18217257307 has 8 divisors (see below), whose sum is σ = 19615791600. Its totient is φ = 16855048704.

The previous prime is 18217257283. The next prime is 18217257329. The reversal of 18217257307 is 70375271281.

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-18217257307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18217257347) 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 7 ways as a sum of consecutive naturals, for example, 9080382 + ... + 9082387.

It is an arithmetic number, because the mean of its divisors is an integer number (2451973950).

Almost surely, 2^18217257307 is an apocalyptic number.

18217257307 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

18217257307 is a deficient number, since it is larger than the sum of its proper divisors (1398534293).

18217257307 is a wasteful number, since it uses less digits than its factorization.

18217257307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18162845.

The product of its (nonzero) digits is 164640, while the sum is 43.

The spelling of 18217257307 in words is "eighteen billion, two hundred seventeen million, two hundred fifty-seven thousand, three hundred seven".