81758653601 has 2 divisors, whose sum is σ = 81758653602. Its totient is φ = 81758653600.

The previous prime is 81758653553. The next prime is 81758653657. The reversal of 81758653601 is 10635685718.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80324062225 + 1434591376 = 283415^2 + 37876^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81758653601 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81758653601.

It is not a weakly prime, because it can be changed into another prime (81758653201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40879326800 + 40879326801.

It is an arithmetic number, because the mean of its divisors is an integer number (40879326801).

Almost surely, 2^81758653601 is an apocalyptic number.

It is an amenable number.

81758653601 is a deficient number, since it is larger than the sum of its proper divisors (1).

81758653601 is an equidigital number, since it uses as much as digits as its factorization.

81758653601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1209600, while the sum is 50.

The spelling of 81758653601 in words is "eighty-one billion, seven hundred fifty-eight million, six hundred fifty-three thousand, six hundred one".