19830321816 has 32 divisors (see below), whose sum is σ = 49590534960. Its totient is φ = 6608143232.

The previous prime is 19830321787. The next prime is 19830321839. The reversal of 19830321816 is 61812303891.

It is a super-2 number, since 2×19830321816² (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, 39135 + ... + 202958.

Almost surely, 2^19830321816 is an apocalyptic number.

It is an amenable number.

19830321816 is an abundant number, since it is smaller than the sum of its proper divisors (29760213144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19830321816 is a wasteful number, since it uses less digits than its factorization.

19830321816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245515 (or 245511 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 42.

The spelling of 19830321816 in words is "nineteen billion, eight hundred thirty million, three hundred twenty-one thousand, eight hundred sixteen".