82691728723 has 2 divisors, whose sum is σ = 82691728724. Its totient is φ = 82691728722.

The previous prime is 82691728663. The next prime is 82691728727. The reversal of 82691728723 is 32782719628.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82691728723 is a prime.

It is not a weakly prime, because it can be changed into another prime (82691728727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41345864361 + 41345864362.

It is an arithmetic number, because the mean of its divisors is an integer number (41345864362).

Almost surely, 2^82691728723 is an apocalyptic number.

82691728723 is a deficient number, since it is larger than the sum of its proper divisors (1).

82691728723 is an equidigital number, since it uses as much as digits as its factorization.

82691728723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4064256, while the sum is 55.

The spelling of 82691728723 in words is "eighty-two billion, six hundred ninety-one million, seven hundred twenty-eight thousand, seven hundred twenty-three".