80505851 has 2 divisors, whose sum is σ = 80505852. Its totient is φ = 80505850.

The previous prime is 80505839. The next prime is 80505871. The reversal of 80505851 is 15850508.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 80505851 - 2²⁶ = 13396987 is a prime.

It is not a weakly prime, because it can be changed into another prime (80505811) 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 as a sum of consecutive naturals, namely, 40252925 + 40252926.

It is an arithmetic number, because the mean of its divisors is an integer number (40252926).

Almost surely, 2^80505851 is an apocalyptic number.

80505851 is a deficient number, since it is larger than the sum of its proper divisors (1).

80505851 is an equidigital number, since it uses as much as digits as its factorization.

80505851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8000, while the sum is 32.

The square root of 80505851 is about 8972.5052800207. The cubic root of 80505851 is about 431.7932162932.

The spelling of 80505851 in words is "eighty million, five hundred five thousand, eight hundred fifty-one".