7851222289872 has 320 divisors, whose sum is σ = 25681356288000. Its totient is φ = 2278179509760.

The previous prime is 7851222289853. The next prime is 7851222289907. The reversal of 7851222289872 is 2789822221587.

7851222289872 is a `hidden beast` number, since 7 + 8 + 51 + 222 + 289 + 87 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8742879 + ... + 9598977.

It is an arithmetic number, because the mean of its divisors is an integer number (80254238400).

Almost surely, 2^{7851222289872} is an apocalyptic number.

7851222289872 is a gapful number since it is divisible by the number (72) 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 7851222289872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12840678144000).

7851222289872 is an abundant number, since it is smaller than the sum of its proper divisors (17830133998128).

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

7851222289872 is a wasteful number, since it uses less digits than its factorization.

7851222289872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856223 (or 856211 counting only the distinct ones).

The product of its digits is 36126720, while the sum is 63.

The spelling of 7851222289872 in words is "seven trillion, eight hundred fifty-one billion, two hundred twenty-two million, two hundred eighty-nine thousand, eight hundred seventy-two".