19800538015 has 8 divisors (see below), whose sum is σ = 23853101040. Its totient is φ = 15778793472.

The previous prime is 19800537983. The next prime is 19800538067. The reversal of 19800538015 is 51083500891.

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 19800538015 - 2⁵ = 19800537983 is a prime.

It is a super-2 number, since 2×19800538015² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 7703205 + ... + 7705774.

It is an arithmetic number, because the mean of its divisors is an integer number (2981637630).

Almost surely, 2^19800538015 is an apocalyptic number.

19800538015 is a deficient number, since it is larger than the sum of its proper divisors (4052563025).

19800538015 is a wasteful number, since it uses less digits than its factorization.

19800538015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15409241.

The product of its (nonzero) digits is 43200, while the sum is 40.

The spelling of 19800538015 in words is "nineteen billion, eight hundred million, five hundred thirty-eight thousand, fifteen".