80780844349 has 2 divisors, whose sum is σ = 80780844350. Its totient is φ = 80780844348.

The previous prime is 80780844337. The next prime is 80780844367. The reversal of 80780844349 is 94344808708.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59198296249 + 21582548100 = 243307^2 + 146910^2 .

It is a cyclic number.

It is not a de Polignac number, because 80780844349 - 2²³ = 80772455741 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 80780844349.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80780844379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40390422174 + 40390422175.

It is an arithmetic number, because the mean of its divisors is an integer number (40390422175).

Almost surely, 2^80780844349 is an apocalyptic number.

It is an amenable number.

80780844349 is a deficient number, since it is larger than the sum of its proper divisors (1).

80780844349 is an equidigital number, since it uses as much as digits as its factorization.

80780844349 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6193152, while the sum is 55.

The spelling of 80780844349 in words is "eighty billion, seven hundred eighty million, eight hundred forty-four thousand, three hundred forty-nine".