80717817979 has 2 divisors, whose sum is σ = 80717817980. Its totient is φ = 80717817978.

The previous prime is 80717817911. The next prime is 80717817991. The reversal of 80717817979 is 97971871708.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 80717817979 - 2¹⁹ = 80717293691 is a prime.

It is a super-2 number, since 2×80717817979² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 80717817979.

It is not a weakly prime, because it can be changed into another prime (80717827979) 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, 40358908989 + 40358908990.

It is an arithmetic number, because the mean of its divisors is an integer number (40358908990).

Almost surely, 2^80717817979 is an apocalyptic number.

80717817979 is a deficient number, since it is larger than the sum of its proper divisors (1).

80717817979 is an equidigital number, since it uses as much as digits as its factorization.

80717817979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12446784, while the sum is 64.

The spelling of 80717817979 in words is "eighty billion, seven hundred seventeen million, eight hundred seventeen thousand, nine hundred seventy-nine".