80368778644 has 120 divisors (see below), whose sum is σ = 179427578400. Its totient is φ = 31236488640.

The previous prime is 80368778639. The next prime is 80368778647. The reversal of 80368778644 is 44687786308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80368778647) 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 39 ways as a sum of consecutive naturals, for example, 65393022 + ... + 65394250.

It is an arithmetic number, because the mean of its divisors is an integer number (1495229820).

Almost surely, 2^80368778644 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 80368778644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89713789200).

80368778644 is an abundant number, since it is smaller than the sum of its proper divisors (99058799756).

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

80368778644 is a wasteful number, since it uses less digits than its factorization.

80368778644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1891 (or 1868 counting only the distinct ones).

The product of its (nonzero) digits is 43352064, while the sum is 61.

The spelling of 80368778644 in words is "eighty billion, three hundred sixty-eight million, seven hundred seventy-eight thousand, six hundred forty-four".