819469919661 has 16 divisors (see below), whose sum is σ = 1103492858880. Its totient is φ = 540880603200.

The previous prime is 819469919627. The next prime is 819469919677. The reversal of 819469919661 is 166919964918.

It is not a de Polignac number, because 819469919661 - 2³⁸ = 544592012717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (819469919621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9361251 + ... + 9448383.

It is an arithmetic number, because the mean of its divisors is an integer number (68968303680).

Almost surely, 2^819469919661 is an apocalyptic number.

It is an amenable number.

819469919661 is a deficient number, since it is larger than the sum of its proper divisors (284022939219).

819469919661 is a wasteful number, since it uses less digits than its factorization.

819469919661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118276.

The product of its digits is 45349632, while the sum is 69.

The spelling of 819469919661 in words is "eight hundred nineteen billion, four hundred sixty-nine million, nine hundred nineteen thousand, six hundred sixty-one".