80666539139 has 2 divisors, whose sum is σ = 80666539140. Its totient is φ = 80666539138.

The previous prime is 80666539127. The next prime is 80666539253. The reversal of 80666539139 is 93193566608.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80666539139 is a prime.

It is a super-2 number, since 2×80666539139² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (80666532139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40333269569 + 40333269570.

It is an arithmetic number, because the mean of its divisors is an integer number (40333269570).

Almost surely, 2^80666539139 is an apocalyptic number.

80666539139 is a deficient number, since it is larger than the sum of its proper divisors (1).

80666539139 is an equidigital number, since it uses as much as digits as its factorization.

80666539139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6298560, while the sum is 56.

The spelling of 80666539139 in words is "eighty billion, six hundred sixty-six million, five hundred thirty-nine thousand, one hundred thirty-nine".