80556739 has 2 divisors, whose sum is σ = 80556740. Its totient is φ = 80556738.

The previous prime is 80556737. The next prime is 80556779. The reversal of 80556739 is 93765508.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 80556739 - 2¹ = 80556737 is a prime.

Together with 80556737, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 80556695 and 80556704.

It is not a weakly prime, because it can be changed into another prime (80556737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40278369 + 40278370.

It is an arithmetic number, because the mean of its divisors is an integer number (40278370).

Almost surely, 2^80556739 is an apocalyptic number.

80556739 is a deficient number, since it is larger than the sum of its proper divisors (1).

80556739 is an equidigital number, since it uses as much as digits as its factorization.

80556739 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 226800, while the sum is 43.

The square root of 80556739 is about 8975.3406063503. The cubic root of 80556739 is about 431.8841764110.

The spelling of 80556739 in words is "eighty million, five hundred fifty-six thousand, seven hundred thirty-nine".