80641674661 has 2 divisors, whose sum is σ = 80641674662. Its totient is φ = 80641674660.

The previous prime is 80641674653. The next prime is 80641674667. The reversal of 80641674661 is 16647614608.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69060686436 + 11580988225 = 262794^2 + 107615^2 .

It is a cyclic number.

It is not a de Polignac number, because 80641674661 - 2³ = 80641674653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80641674667) 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, 40320837330 + 40320837331.

It is an arithmetic number, because the mean of its divisors is an integer number (40320837331).

Almost surely, 2^80641674661 is an apocalyptic number.

It is an amenable number.

80641674661 is a deficient number, since it is larger than the sum of its proper divisors (1).

80641674661 is an equidigital number, since it uses as much as digits as its factorization.

80641674661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1161216, while the sum is 49.

The spelling of 80641674661 in words is "eighty billion, six hundred forty-one million, six hundred seventy-four thousand, six hundred sixty-one".