805210055639 has 6 divisors (see below), whose sum is σ = 885065598480. Its totient is φ = 732009141380.

The previous prime is 805210055597. The next prime is 805210055677. The reversal of 805210055639 is 936550012508.

It is not a de Polignac number, because 805210055639 - 2²⁰ = 805209007063 is a prime.

It is a super-2 number, since 2×805210055639² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 805210055639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (805210052639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3327314159 + ... + 3327314400.

It is an arithmetic number, because the mean of its divisors is an integer number (147510933080).

Almost surely, 2^805210055639 is an apocalyptic number.

805210055639 is a deficient number, since it is larger than the sum of its proper divisors (79855542841).

805210055639 is a wasteful number, since it uses less digits than its factorization.

805210055639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6654628581 (or 6654628570 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 44.

The spelling of 805210055639 in words is "eight hundred five billion, two hundred ten million, fifty-five thousand, six hundred thirty-nine".