80728357117 has 4 divisors (see below), whose sum is σ = 80730987040. Its totient is φ = 80725727196.

The previous prime is 80728357103. The next prime is 80728357123. The reversal of 80728357117 is 71175382708.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 80728357117 - 2¹¹ = 80728355069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80728357217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1268367 + ... + 1330492.

It is an arithmetic number, because the mean of its divisors is an integer number (20182746760).

Almost surely, 2^80728357117 is an apocalyptic number.

It is an amenable number.

80728357117 is a deficient number, since it is larger than the sum of its proper divisors (2629923).

80728357117 is a wasteful number, since it uses less digits than its factorization.

80728357117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2629922.

The product of its (nonzero) digits is 658560, while the sum is 49.

The spelling of 80728357117 in words is "eighty billion, seven hundred twenty-eight million, three hundred fifty-seven thousand, one hundred seventeen".