18319820501 has 8 divisors (see below), whose sum is σ = 19285715520. Its totient is φ = 17354094912.

The previous prime is 18319820447. The next prime is 18319820509. The reversal of 18319820501 is 10502891381.

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 18319820501 - 2²⁶ = 18252711637 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 (18319820509) 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, 221936 + ... + 293078.

It is an arithmetic number, because the mean of its divisors is an integer number (2410714440).

Almost surely, 2^18319820501 is an apocalyptic number.

It is an amenable number.

18319820501 is a deficient number, since it is larger than the sum of its proper divisors (965895019).

18319820501 is a wasteful number, since it uses less digits than its factorization.

18319820501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84715.

The product of its (nonzero) digits is 17280, while the sum is 38.

The spelling of 18319820501 in words is "eighteen billion, three hundred nineteen million, eight hundred twenty thousand, five hundred one".