18003857497 has 8 divisors (see below), whose sum is σ = 19347430176. Its totient is φ = 16691898432.

The previous prime is 18003857483. The next prime is 18003857513. The reversal of 18003857497 is 79475830081.

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-18003857497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18003857297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7902223 + ... + 7904500.

It is an arithmetic number, because the mean of its divisors is an integer number (2418428772).

Almost surely, 2^18003857497 is an apocalyptic number.

18003857497 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18003857497 is a deficient number, since it is larger than the sum of its proper divisors (1343572679).

18003857497 is a wasteful number, since it uses less digits than its factorization.

18003857497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15806807.

The product of its (nonzero) digits is 1693440, while the sum is 52.

The spelling of 18003857497 in words is "eighteen billion, three million, eight hundred fifty-seven thousand, four hundred ninety-seven".