80389377781 has 2 divisors, whose sum is σ = 80389377782. Its totient is φ = 80389377780.

The previous prime is 80389377779. The next prime is 80389377791. The reversal of 80389377781 is 18777398308.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41832520900 + 38556856881 = 204530^2 + 196359^2 .

It is a cyclic number.

It is not a de Polignac number, because 80389377781 - 2¹ = 80389377779 is a prime.

It is a super-2 number, since 2×80389377781² (a number of 23 digits) contains 22 as substring.

Together with 80389377779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80389377791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40194688890 + 40194688891.

It is an arithmetic number, because the mean of its divisors is an integer number (40194688891).

Almost surely, 2^80389377781 is an apocalyptic number.

It is an amenable number.

80389377781 is a deficient number, since it is larger than the sum of its proper divisors (1).

80389377781 is an equidigital number, since it uses as much as digits as its factorization.

80389377781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14224896, while the sum is 61.

The spelling of 80389377781 in words is "eighty billion, three hundred eighty-nine million, three hundred seventy-seven thousand, seven hundred eighty-one".