205215582805836 has 96 divisors (see below), whose sum is σ = 509091687982080. Its totient is φ = 64195385270016.

The previous prime is 205215582805817. The next prime is 205215582805853. The reversal of 205215582805836 is 638508285512502.

It is a super-2 number, since 2×205215582805836² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 205215582805836.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1330910001 + ... + 1331064183.

It is an arithmetic number, because the mean of its divisors is an integer number (5303038416480).

Almost surely, 2^{205215582805836} is an apocalyptic number.

It is an amenable number.

205215582805836 is an abundant number, since it is smaller than the sum of its proper divisors (303876105176244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205215582805836 is a wasteful number, since it uses less digits than its factorization.

205215582805836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245255 (or 245253 counting only the distinct ones).

The product of its (nonzero) digits is 46080000, while the sum is 60.

The spelling of 205215582805836 in words is "two hundred five trillion, two hundred fifteen billion, five hundred eighty-two million, eight hundred five thousand, eight hundred thirty-six".