819436220636 has 12 divisors (see below), whose sum is σ = 1564378239480. Its totient is φ = 372471009360.

The previous prime is 819436220623. The next prime is 819436220657. The reversal of 819436220636 is 636022634918.

It is a super-2 number, since 2×819436220636² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9311775191 + ... + 9311775278.

It is an arithmetic number, because the mean of its divisors is an integer number (130364853290).

Almost surely, 2^819436220636 is an apocalyptic number.

It is an amenable number.

819436220636 is a deficient number, since it is larger than the sum of its proper divisors (744942018844).

819436220636 is a wasteful number, since it uses less digits than its factorization.

819436220636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18623550484 (or 18623550482 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 50.

The spelling of 819436220636 in words is "eight hundred nineteen billion, four hundred thirty-six million, two hundred twenty thousand, six hundred thirty-six".