857775661056 has 336 divisors, whose sum is σ = 2705003683200. Its totient is φ = 270864580608.

The previous prime is 857775661031. The next prime is 857775661079. The reversal of 857775661056 is 650166577758.

857775661056 is a `hidden beast` number, since 8 + 5 + 7 + 7 + 7 + 5 + 6 + 610 + 5 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 857775660984 and 857775661002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37811125 + ... + 37833803.

It is an arithmetic number, because the mean of its divisors is an integer number (8050606200).

Almost surely, 2^857775661056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 857775661056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1352501841600).

857775661056 is an abundant number, since it is smaller than the sum of its proper divisors (1847228022144).

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

857775661056 is an equidigital number, since it uses as much as digits as its factorization.

857775661056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22739 (or 22703 counting only the distinct ones).

The product of its (nonzero) digits is 74088000, while the sum is 63.

The spelling of 857775661056 in words is "eight hundred fifty-seven billion, seven hundred seventy-five million, six hundred sixty-one thousand, fifty-six".