819699943444 has 48 divisors (see below), whose sum is σ = 1524873083328. Its totient is φ = 384213938688.

The previous prime is 819699943417. The next prime is 819699943493. The reversal of 819699943444 is 444349996918.

819699943444 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×819699943444² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71627587 + ... + 71639029.

It is an arithmetic number, because the mean of its divisors is an integer number (31768189236).

Almost surely, 2^819699943444 is an apocalyptic number.

It is an amenable number.

819699943444 is a deficient number, since it is larger than the sum of its proper divisors (705173139884).

819699943444 is a wasteful number, since it uses less digits than its factorization.

819699943444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15544 (or 15542 counting only the distinct ones).

The product of its digits is 241864704, while the sum is 70.

The spelling of 819699943444 in words is "eight hundred nineteen billion, six hundred ninety-nine million, nine hundred forty-three thousand, four hundred forty-four".