80643389568 has 128 divisors (see below), whose sum is σ = 245459328000. Its totient is φ = 22979884032.

The previous prime is 80643389551. The next prime is 80643389569. The reversal of 80643389568 is 86598334608.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×80643389568² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (80643389569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 979173 + ... + 1058331.

It is an arithmetic number, because the mean of its divisors is an integer number (1917651000).

Almost surely, 2^80643389568 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 80643389568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122729664000).

80643389568 is an abundant number, since it is smaller than the sum of its proper divisors (164815938432).

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

80643389568 is a wasteful number, since it uses less digits than its factorization.

80643389568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79562 (or 79550 counting only the distinct ones).

The product of its (nonzero) digits is 29859840, while the sum is 60.

The spelling of 80643389568 in words is "eighty billion, six hundred forty-three million, three hundred eighty-nine thousand, five hundred sixty-eight".