81814768777727 has 2 divisors, whose sum is σ = 81814768777728. Its totient is φ = 81814768777726.

The previous prime is 81814768777711. The next prime is 81814768777741. The reversal of 81814768777727 is 72777786741818.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81814768777727 - 2⁴ = 81814768777711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81814768777127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40907384388863 + 40907384388864.

It is an arithmetic number, because the mean of its divisors is an integer number (40907384388864).

Almost surely, 2^{81814768777727} is an apocalyptic number.

81814768777727 is a deficient number, since it is larger than the sum of its proper divisors (1).

81814768777727 is an equidigital number, since it uses as much as digits as its factorization.

81814768777727 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2891341824, while the sum is 80.

The spelling of 81814768777727 in words is "eighty-one trillion, eight hundred fourteen billion, seven hundred sixty-eight million, seven hundred seventy-seven thousand, seven hundred twenty-seven".