855643909122 has 54 divisors (see below), whose sum is σ = 1863218515977. Its totient is φ = 283787431632.

The previous prime is 855643909121. The next prime is 855643909129. The reversal of 855643909122 is 221909346558.

855643909122 is a `hidden beast` number, since 85 + 5 + 6 + 439 + 0 + 9 + 122 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 850712920281 + 4930988841 = 922341^2 + 70221^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=654081.

It is not an unprimeable number, because it can be changed into a prime (855643909121) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1032139404 + ... + 1032140232.

Almost surely, 2^855643909122 is an apocalyptic number.

855643909122 is an abundant number, since it is smaller than the sum of its proper divisors (1007574606855).

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

855643909122 is an frugal number, since it uses more digits than its factorization.

855643909122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2192 (or 1097 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 54.

The spelling of 855643909122 in words is "eight hundred fifty-five billion, six hundred forty-three million, nine hundred nine thousand, one hundred twenty-two".