81950492567 has 2 divisors, whose sum is σ = 81950492568. Its totient is φ = 81950492566.

The previous prime is 81950492557. The next prime is 81950492593. The reversal of 81950492567 is 76529405918.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81950492567 - 2¹² = 81950488471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81950492527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40975246283 + 40975246284.

It is an arithmetic number, because the mean of its divisors is an integer number (40975246284).

Almost surely, 2^81950492567 is an apocalyptic number.

81950492567 is a deficient number, since it is larger than the sum of its proper divisors (1).

81950492567 is an equidigital number, since it uses as much as digits as its factorization.

81950492567 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5443200, while the sum is 56.

The spelling of 81950492567 in words is "eighty-one billion, nine hundred fifty million, four hundred ninety-two thousand, five hundred sixty-seven".