850499780129 has 16 divisors (see below), whose sum is σ = 855875019600. Its totient is φ = 845144724480.

The previous prime is 850499780111. The next prime is 850499780159. The reversal of 850499780129 is 921087994058.

It can be written as a sum of positive squares in 8 ways, for example, as 174182691904 + 676317088225 = 417352^2 + 822385^2 .

It is a cyclic number.

It is not a de Polignac number, because 850499780129 - 2²⁰ = 850498731553 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (850499780159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 182940197 + ... + 182944845.

It is an arithmetic number, because the mean of its divisors is an integer number (53492188725).

Almost surely, 2^850499780129 is an apocalyptic number.

It is an amenable number.

850499780129 is a deficient number, since it is larger than the sum of its proper divisors (5375239471).

850499780129 is a wasteful number, since it uses less digits than its factorization.

850499780129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6580.

The product of its (nonzero) digits is 13063680, while the sum is 62.

The spelling of 850499780129 in words is "eight hundred fifty billion, four hundred ninety-nine million, seven hundred eighty thousand, one hundred twenty-nine".