80191721456 has 120 divisors (see below), whose sum is σ = 197320607280. Its totient is φ = 31219507200.

The previous prime is 80191721431. The next prime is 80191721471. The reversal of 80191721456 is 65412719108.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14735696 + ... + 14741136.

It is an arithmetic number, because the mean of its divisors is an integer number (1644338394).

Almost surely, 2^80191721456 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 80191721456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98660303640).

80191721456 is an abundant number, since it is smaller than the sum of its proper divisors (117128885824).

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

80191721456 is a wasteful number, since it uses less digits than its factorization.

80191721456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7183 (or 7170 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 44.

The spelling of 80191721456 in words is "eighty billion, one hundred ninety-one million, seven hundred twenty-one thousand, four hundred fifty-six".