18103217523 has 8 divisors (see below), whose sum is σ = 24144857088. Its totient is φ = 12065194824.

The previous prime is 18103217519. The next prime is 18103217551. The reversal of 18103217523 is 32571230181.

It is a happy number.

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

It is not a de Polignac number, because 18103217523 - 2² = 18103217519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18103227523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 892515 + ... + 912572.

It is an arithmetic number, because the mean of its divisors is an integer number (3018107136).

Almost surely, 2^18103217523 is an apocalyptic number.

18103217523 is a deficient number, since it is larger than the sum of its proper divisors (6041639565).

18103217523 is a wasteful number, since it uses less digits than its factorization.

18103217523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1808433.

The product of its (nonzero) digits is 10080, while the sum is 33.

The spelling of 18103217523 in words is "eighteen billion, one hundred three million, two hundred seventeen thousand, five hundred twenty-three".