849900121687 has 16 divisors (see below), whose sum is σ = 874583728128. Its totient is φ = 825443730720.

The previous prime is 849900121657. The next prime is 849900121691. The reversal of 849900121687 is 786121009948.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 849900121687 - 2⁷ = 849900121559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (849900121657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20865313 + ... + 20906005.

It is an arithmetic number, because the mean of its divisors is an integer number (54661483008).

Almost surely, 2^849900121687 is an apocalyptic number.

849900121687 is a deficient number, since it is larger than the sum of its proper divisors (24683606441).

849900121687 is a wasteful number, since it uses less digits than its factorization.

849900121687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43470.

The product of its (nonzero) digits is 1741824, while the sum is 55.

The spelling of 849900121687 in words is "eight hundred forty-nine billion, nine hundred million, one hundred twenty-one thousand, six hundred eighty-seven".