846745399821 has 16 divisors (see below), whose sum is σ = 1190895667200. Its totient is φ = 533670086448.

The previous prime is 846745399813. The next prime is 846745399867. The reversal of 846745399821 is 128993547648.

It is a happy number.

846745399821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 846745399821 - 2³ = 846745399813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (846745399811) 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, 15479151 + ... + 15533756.

It is an arithmetic number, because the mean of its divisors is an integer number (74430979200).

Almost surely, 2^846745399821 is an apocalyptic number.

It is an amenable number.

846745399821 is a deficient number, since it is larger than the sum of its proper divisors (344150267379).

846745399821 is a wasteful number, since it uses less digits than its factorization.

846745399821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31013408.

The product of its digits is 104509440, while the sum is 66.

The spelling of 846745399821 in words is "eight hundred forty-six billion, seven hundred forty-five million, three hundred ninety-nine thousand, eight hundred twenty-one".