80644360068 has 72 divisors (see below), whose sum is σ = 207814003488. Its totient is φ = 26363595648.

The previous prime is 80644360067. The next prime is 80644360073. The reversal of 80644360068 is 86006344608.

It is not an unprimeable number, because it can be changed into a prime (80644360067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 310855 + ... + 507857.

It is an arithmetic number, because the mean of its divisors is an integer number (2886305604).

Almost surely, 2^80644360068 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 80644360068, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103907001744).

80644360068 is an abundant number, since it is smaller than the sum of its proper divisors (127169643420).

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

80644360068 is a wasteful number, since it uses less digits than its factorization.

80644360068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197233 (or 197228 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 45.

The spelling of 80644360068 in words is "eighty billion, six hundred forty-four million, three hundred sixty thousand, sixty-eight".