805519311819 has 4 divisors (see below), whose sum is σ = 1074025749096. Its totient is φ = 537012874544.

The previous prime is 805519311679. The next prime is 805519311823. The reversal of 805519311819 is 918113915508.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 805519311819 - 2⁸ = 805519311563 is a prime.

It is a super-2 number, since 2×805519311819² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (805519311859) 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, 134253218634 + ... + 134253218639.

It is an arithmetic number, because the mean of its divisors is an integer number (268506437274).

Almost surely, 2^805519311819 is an apocalyptic number.

805519311819 is a deficient number, since it is larger than the sum of its proper divisors (268506437277).

805519311819 is a wasteful number, since it uses less digits than its factorization.

805519311819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268506437276.

The product of its (nonzero) digits is 388800, while the sum is 51.

The spelling of 805519311819 in words is "eight hundred five billion, five hundred nineteen million, three hundred eleven thousand, eight hundred nineteen".