81353045723 has 2 divisors, whose sum is σ = 81353045724. Its totient is φ = 81353045722.

The previous prime is 81353045713. The next prime is 81353045729. The reversal of 81353045723 is 32754035318.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81353045723 - 2¹⁶ = 81352980187 is a prime.

It is not a weakly prime, because it can be changed into another prime (81353045729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40676522861 + 40676522862.

It is an arithmetic number, because the mean of its divisors is an integer number (40676522862).

Almost surely, 2^81353045723 is an apocalyptic number.

81353045723 is a deficient number, since it is larger than the sum of its proper divisors (1).

81353045723 is an equidigital number, since it uses as much as digits as its factorization.

81353045723 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 302400, while the sum is 41.

The spelling of 81353045723 in words is "eighty-one billion, three hundred fifty-three million, forty-five thousand, seven hundred twenty-three".