856947244500 has 432 divisors, whose sum is σ = 2833760547072. Its totient is φ = 217954800000.

The previous prime is 856947244493. The next prime is 856947244501. The reversal of 856947244500 is 5442749658.

856947244500 is a `hidden beast` number, since 8 + 5 + 6 + 94 + 7 + 2 + 44 + 500 = 666.

It is a super-2 number, since 2×856947244500² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856947244501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 307038105 + ... + 307040895.

It is an arithmetic number, because the mean of its divisors is an integer number (6559630896).

Almost surely, 2^856947244500 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 856947244500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1416880273536).

856947244500 is an abundant number, since it is smaller than the sum of its proper divisors (1976813302572).

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

856947244500 is a wasteful number, since it uses less digits than its factorization.

856947244500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2949 (or 2903 counting only the distinct ones).

The product of its (nonzero) digits is 9676800, while the sum is 54.

The spelling of 856947244500 in words is "eight hundred fifty-six billion, nine hundred forty-seven million, two hundred forty-four thousand, five hundred".