80736727921 has 4 divisors (see below), whose sum is σ = 80748025344. Its totient is φ = 80725430500.

The previous prime is 80736727849. The next prime is 80736727927. The reversal of 80736727921 is 12972763708.

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 80736727921 - 2²³ = 80728339313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80736727927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5637985 + ... + 5652286.

It is an arithmetic number, because the mean of its divisors is an integer number (20187006336).

Almost surely, 2^80736727921 is an apocalyptic number.

It is an amenable number.

80736727921 is a deficient number, since it is larger than the sum of its proper divisors (11297423).

80736727921 is a wasteful number, since it uses less digits than its factorization.

80736727921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11297422.

The product of its (nonzero) digits is 1778112, while the sum is 52.

The spelling of 80736727921 in words is "eighty billion, seven hundred thirty-six million, seven hundred twenty-seven thousand, nine hundred twenty-one".