81724290727 has 2 divisors, whose sum is σ = 81724290728. Its totient is φ = 81724290726.

The previous prime is 81724290701. The next prime is 81724290751. The reversal of 81724290727 is 72709242718.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81724290727 - 2²⁷ = 81590072999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81724290787) 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, 40862145363 + 40862145364.

It is an arithmetic number, because the mean of its divisors is an integer number (40862145364).

Almost surely, 2^81724290727 is an apocalyptic number.

81724290727 is a deficient number, since it is larger than the sum of its proper divisors (1).

81724290727 is an equidigital number, since it uses as much as digits as its factorization.

81724290727 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 790272, while the sum is 49.

The spelling of 81724290727 in words is "eighty-one billion, seven hundred twenty-four million, two hundred ninety thousand, seven hundred twenty-seven".