80449481669 has 2 divisors, whose sum is σ = 80449481670. Its totient is φ = 80449481668.

The previous prime is 80449481587. The next prime is 80449481677. The reversal of 80449481669 is 96618494408.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50788031044 + 29661450625 = 225362^2 + 172225^2 .

It is a cyclic number.

It is not a de Polignac number, because 80449481669 - 2¹⁶ = 80449416133 is a prime.

It is a super-2 number, since 2×80449481669² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80449481569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40224740834 + 40224740835.

It is an arithmetic number, because the mean of its divisors is an integer number (40224740835).

Almost surely, 2^80449481669 is an apocalyptic number.

It is an amenable number.

80449481669 is a deficient number, since it is larger than the sum of its proper divisors (1).

80449481669 is an equidigital number, since it uses as much as digits as its factorization.

80449481669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11943936, while the sum is 59.

The spelling of 80449481669 in words is "eighty billion, four hundred forty-nine million, four hundred eighty-one thousand, six hundred sixty-nine".