81976320463 has 2 divisors, whose sum is σ = 81976320464. Its totient is φ = 81976320462.

The previous prime is 81976320427. The next prime is 81976320539. The reversal of 81976320463 is 36402367918.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81976320463 - 2¹⁷ = 81976189391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81976320563) 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, 40988160231 + 40988160232.

It is an arithmetic number, because the mean of its divisors is an integer number (40988160232).

Almost surely, 2^81976320463 is an apocalyptic number.

81976320463 is a deficient number, since it is larger than the sum of its proper divisors (1).

81976320463 is an equidigital number, since it uses as much as digits as its factorization.

81976320463 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1306368, while the sum is 49.

The spelling of 81976320463 in words is "eighty-one billion, nine hundred seventy-six million, three hundred twenty thousand, four hundred sixty-three".