819893313865 has 8 divisors (see below), whose sum is σ = 1015609782528. Its totient is φ = 634756113840.

The previous prime is 819893313847. The next prime is 819893313881. The reversal of 819893313865 is 568313398918.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 819893313865 - 2²³ = 819884925257 is a prime.

It is a super-2 number, since 2×819893313865² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 819893313797 and 819893313806.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2644816987 + ... + 2644817296.

It is an arithmetic number, because the mean of its divisors is an integer number (126951222816).

Almost surely, 2^819893313865 is an apocalyptic number.

It is an amenable number.

819893313865 is a deficient number, since it is larger than the sum of its proper divisors (195716468663).

819893313865 is a wasteful number, since it uses less digits than its factorization.

819893313865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5289634319.

The product of its digits is 33592320, while the sum is 64.

The spelling of 819893313865 in words is "eight hundred nineteen billion, eight hundred ninety-three million, three hundred thirteen thousand, eight hundred sixty-five".