70643321856 has 220 divisors, whose sum is σ = 213644898720. Its totient is φ = 23247544320.

The previous prime is 70643321851. The next prime is 70643321867. The reversal of 70643321856 is 65812334607.

It is not an unprimeable number, because it can be changed into a prime (70643321851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6547186 + ... + 6557966.

It is an arithmetic number, because the mean of its divisors is an integer number (971113176).

Almost surely, 2^70643321856 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 70643321856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106822449360).

70643321856 is an abundant number, since it is smaller than the sum of its proper divisors (143001576864).

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

70643321856 is a wasteful number, since it uses less digits than its factorization.

70643321856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10892 (or 10865 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The spelling of 70643321856 in words is "seventy billion, six hundred forty-three million, three hundred twenty-one thousand, eight hundred fifty-six".