855638899200 has 1200 divisors, whose sum is σ = 3277460916576. Its totient is φ = 220365619200.

The previous prime is 855638899177. The next prime is 855638899211. The reversal of 855638899200 is 2998836558.

It is a tau number, because it is divible by the number of its divisors (1200).

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 5249318319 + ... + 5249318481.

Almost surely, 2^855638899200 is an apocalyptic number.

855638899200 is a gapful number since it is divisible by the number (80) 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 855638899200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1638730458288).

855638899200 is an abundant number, since it is smaller than the sum of its proper divisors (2421822017376).

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

855638899200 is a wasteful number, since it uses less digits than its factorization.

855638899200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347 (or 317 counting only the distinct ones).

The product of its (nonzero) digits is 37324800, while the sum is 63.

The spelling of 855638899200 in words is "eight hundred fifty-five billion, six hundred thirty-eight million, eight hundred ninety-nine thousand, two hundred".