80196009721 has 9 divisors (see below), whose sum is σ = 80498743429. Its totient is φ = 79894413436.

The previous prime is 80196009703. The next prime is 80196009731. The reversal of 80196009721 is 12790069108.

The square root of 80196009721 is 283189.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 80196009721 - 2⁵ = 80196009689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80196009701) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 142443786 + ... + 142444348.

Almost surely, 2^80196009721 is an apocalyptic number.

80196009721 is the 283189-th square number.

80196009721 is the 141595-th centered octagonal number.

It is an amenable number.

80196009721 is a deficient number, since it is larger than the sum of its proper divisors (302733708).

80196009721 is an frugal number, since it uses more digits than its factorization.

80196009721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2132 (or 1066 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 43.

The spelling of 80196009721 in words is "eighty billion, one hundred ninety-six million, nine thousand, seven hundred twenty-one".