819854656397 has 32 divisors (see below), whose sum is σ = 954753945600. Its totient is φ = 689516193600.

The previous prime is 819854656391. The next prime is 819854656451. The reversal of 819854656397 is 793656458918.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 819854656397 - 2¹⁴ = 819854640013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 819854656397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (819854656391) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 246127022 + ... + 246130352.

It is an arithmetic number, because the mean of its divisors is an integer number (29836060800).

Almost surely, 2^819854656397 is an apocalyptic number.

It is an amenable number.

819854656397 is a deficient number, since it is larger than the sum of its proper divisors (134899289203).

819854656397 is a wasteful number, since it uses less digits than its factorization.

819854656397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6057.

The product of its digits is 391910400, while the sum is 71.

The spelling of 819854656397 in words is "eight hundred nineteen billion, eight hundred fifty-four million, six hundred fifty-six thousand, three hundred ninety-seven".