855256779648 has 256 divisors, whose sum is σ = 2636983641600. Its totient is φ = 272375820288.

The previous prime is 855256779599. The next prime is 855256779667. The reversal of 855256779648 is 846977652558.

855256779648 is a `hidden beast` number, since 8 + 5 + 52 + 567 + 7 + 9 + 6 + 4 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74474515 + ... + 74485997.

It is an arithmetic number, because the mean of its divisors is an integer number (10300717350).

Almost surely, 2^855256779648 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 855256779648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1318491820800).

855256779648 is an abundant number, since it is smaller than the sum of its proper divisors (1781726861952).

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

855256779648 is a wasteful number, since it uses less digits than its factorization.

855256779648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12466 (or 12448 counting only the distinct ones).

The product of its digits is 1016064000, while the sum is 72.

The spelling of 855256779648 in words is "eight hundred fifty-five billion, two hundred fifty-six million, seven hundred seventy-nine thousand, six hundred forty-eight".