80801340661 has 2 divisors, whose sum is σ = 80801340662. Its totient is φ = 80801340660.

The previous prime is 80801340649. The next prime is 80801340671. The reversal of 80801340661 is 16604310808.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70939659025 + 9861681636 = 266345^2 + 99306^2 .

It is a cyclic number.

It is not a de Polignac number, because 80801340661 - 2¹⁹ = 80800816373 is a prime.

It is a super-2 number, since 2×80801340661² (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 80801340661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80801340671) 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, 40400670330 + 40400670331.

It is an arithmetic number, because the mean of its divisors is an integer number (40400670331).

Almost surely, 2^80801340661 is an apocalyptic number.

It is an amenable number.

80801340661 is a deficient number, since it is larger than the sum of its proper divisors (1).

80801340661 is an equidigital number, since it uses as much as digits as its factorization.

80801340661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 37.

The spelling of 80801340661 in words is "eighty billion, eight hundred one million, three hundred forty thousand, six hundred sixty-one".