850661999 has 4 divisors (see below), whose sum is σ = 927994920. Its totient is φ = 773329080.

The previous prime is 850661899. The next prime is 850662037. The reversal of 850661999 is 999166058.

850661999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 850661999 - 2⁸ = 850661743 is a prime.

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 850661999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (850661099) 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, 38666444 + ... + 38666465.

It is an arithmetic number, because the mean of its divisors is an integer number (231998730).

Almost surely, 2^850661999 is an apocalyptic number.

850661999 is a deficient number, since it is larger than the sum of its proper divisors (77332921).

850661999 is a wasteful number, since it uses less digits than its factorization.

850661999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77332920.

The product of its (nonzero) digits is 1049760, while the sum is 53.

The square root of 850661999 is about 29166.1104537441. The cubic root of 850661999 is about 947.5140912639.

The spelling of 850661999 in words is "eight hundred fifty million, six hundred sixty-one thousand, nine hundred ninety-nine".