81924412723 has 2 divisors, whose sum is σ = 81924412724. Its totient is φ = 81924412722.

The previous prime is 81924412697. The next prime is 81924412883. The reversal of 81924412723 is 32721442918.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81924412723 - 2³³ = 73334478131 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81924412723.

It is not a weakly prime, because it can be changed into another prime (81924412123) 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, 40962206361 + 40962206362.

It is an arithmetic number, because the mean of its divisors is an integer number (40962206362).

Almost surely, 2^81924412723 is an apocalyptic number.

81924412723 is a deficient number, since it is larger than the sum of its proper divisors (1).

81924412723 is an equidigital number, since it uses as much as digits as its factorization.

81924412723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 43.

The spelling of 81924412723 in words is "eighty-one billion, nine hundred twenty-four million, four hundred twelve thousand, seven hundred twenty-three".