80979921287 has 2 divisors, whose sum is σ = 80979921288. Its totient is φ = 80979921286.

The previous prime is 80979921263. The next prime is 80979921293. The reversal of 80979921287 is 78212997908.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 80979921287 - 2²⁶ = 80912812423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80979921227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40489960643 + 40489960644.

It is an arithmetic number, because the mean of its divisors is an integer number (40489960644).

Almost surely, 2^80979921287 is an apocalyptic number.

80979921287 is a deficient number, since it is larger than the sum of its proper divisors (1).

80979921287 is an equidigital number, since it uses as much as digits as its factorization.

80979921287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9144576, while the sum is 62.

The spelling of 80979921287 in words is "eighty billion, nine hundred seventy-nine million, nine hundred twenty-one thousand, two hundred eighty-seven".