81352578823 has 2 divisors, whose sum is σ = 81352578824. Its totient is φ = 81352578822.

The previous prime is 81352578781. The next prime is 81352578833. The reversal of 81352578823 is 32887525318.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81352578823 - 2²⁹ = 80815707911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81352578833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40676289411 + 40676289412.

It is an arithmetic number, because the mean of its divisors is an integer number (40676289412).

Almost surely, 2^81352578823 is an apocalyptic number.

81352578823 is a deficient number, since it is larger than the sum of its proper divisors (1).

81352578823 is an equidigital number, since it uses as much as digits as its factorization.

81352578823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3225600, while the sum is 52.

The spelling of 81352578823 in words is "eighty-one billion, three hundred fifty-two million, five hundred seventy-eight thousand, eight hundred twenty-three".