81833292641 has 2 divisors, whose sum is σ = 81833292642. Its totient is φ = 81833292640.

The previous prime is 81833292599. The next prime is 81833292643. The reversal of 81833292641 is 14629233818.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48955987600 + 32877305041 = 221260^2 + 181321^2 .

It is a cyclic number.

It is not a de Polignac number, because 81833292641 - 2²⁶ = 81766183777 is a prime.

Together with 81833292643, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81833292643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40916646320 + 40916646321.

It is an arithmetic number, because the mean of its divisors is an integer number (40916646321).

Almost surely, 2^81833292641 is an apocalyptic number.

It is an amenable number.

81833292641 is a deficient number, since it is larger than the sum of its proper divisors (1).

81833292641 is an equidigital number, since it uses as much as digits as its factorization.

81833292641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 47.

The spelling of 81833292641 in words is "eighty-one billion, eight hundred thirty-three million, two hundred ninety-two thousand, six hundred forty-one".