819795404493809 has 4 divisors (see below), whose sum is σ = 824704359011904. Its totient is φ = 814886449975716.

The previous prime is 819795404493803. The next prime is 819795404493851. The reversal of 819795404493809 is 908394404597918.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 819795404493809 - 2⁸ = 819795404493553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (819795404493803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2454477258797 + ... + 2454477259130.

It is an arithmetic number, because the mean of its divisors is an integer number (206176089752976).

Almost surely, 2^{819795404493809} is an apocalyptic number.

It is an amenable number.

819795404493809 is a deficient number, since it is larger than the sum of its proper divisors (4908954518095).

819795404493809 is a wasteful number, since it uses less digits than its factorization.

819795404493809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4908954518094.

The product of its (nonzero) digits is 2821754880, while the sum is 80.

The spelling of 819795404493809 in words is "eight hundred nineteen trillion, seven hundred ninety-five billion, four hundred four million, four hundred ninety-three thousand, eight hundred nine".