857385550648 has 128 divisors (see below), whose sum is σ = 1830467911680. Its totient is φ = 372960000000.

The previous prime is 857385550607. The next prime is 857385550759. The reversal of 857385550648 is 846055583758.

It is a self number, because there is not a number n which added to its sum of digits gives 857385550648.

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, 330907833 + ... + 330910423.

It is an arithmetic number, because the mean of its divisors is an integer number (14300530560).

Almost surely, 2^857385550648 is an apocalyptic number.

857385550648 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 857385550648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (915233955840).

857385550648 is an abundant number, since it is smaller than the sum of its proper divisors (973082361032).

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

857385550648 is a wasteful number, since it uses less digits than its factorization.

857385550648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3941 (or 3937 counting only the distinct ones).

The product of its (nonzero) digits is 161280000, while the sum is 64.

The spelling of 857385550648 in words is "eight hundred fifty-seven billion, three hundred eighty-five million, five hundred fifty thousand, six hundred forty-eight".