81733563311 has 2 divisors, whose sum is σ = 81733563312. Its totient is φ = 81733563310.

The previous prime is 81733563187. The next prime is 81733563383. The reversal of 81733563311 is 11336533718.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81733563311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81733562311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40866781655 + 40866781656.

It is an arithmetic number, because the mean of its divisors is an integer number (40866781656).

Almost surely, 2^81733563311 is an apocalyptic number.

81733563311 is a deficient number, since it is larger than the sum of its proper divisors (1).

81733563311 is an equidigital number, since it uses as much as digits as its factorization.

81733563311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 41.

The spelling of 81733563311 in words is "eighty-one billion, seven hundred thirty-three million, five hundred sixty-three thousand, three hundred eleven".