819457886623 has 4 divisors (see below), whose sum is σ = 821522012680. Its totient is φ = 817393760568.

The previous prime is 819457886609. The next prime is 819457886669. The reversal of 819457886623 is 326688754918.

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 819457886623 - 2⁵ = 819457886591 is a prime.

It is a super-2 number, since 2×819457886623² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (819457886603) 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, 1032062433 + ... + 1032063226.

It is an arithmetic number, because the mean of its divisors is an integer number (205380503170).

Almost surely, 2^819457886623 is an apocalyptic number.

819457886623 is a deficient number, since it is larger than the sum of its proper divisors (2064126057).

819457886623 is a wasteful number, since it uses less digits than its factorization.

819457886623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2064126056.

The product of its digits is 139345920, while the sum is 67.

The spelling of 819457886623 in words is "eight hundred nineteen billion, four hundred fifty-seven million, eight hundred eighty-six thousand, six hundred twenty-three".