819699943445 has 16 divisors (see below), whose sum is σ = 993202430400. Its totient is φ = 649389519744.

The previous prime is 819699943417. The next prime is 819699943493. The reversal of 819699943445 is 544349996918.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-819699943445 is a prime.

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, 1160129 + ... + 1727801.

It is an arithmetic number, because the mean of its divisors is an integer number (62075151900).

Almost surely, 2^819699943445 is an apocalyptic number.

It is an amenable number.

819699943445 is a deficient number, since it is larger than the sum of its proper divisors (173502486955).

819699943445 is a wasteful number, since it uses less digits than its factorization.

819699943445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570484.

The product of its digits is 302330880, while the sum is 71.

The spelling of 819699943445 in words is "eight hundred nineteen billion, six hundred ninety-nine million, nine hundred forty-three thousand, four hundred forty-five".