71635599649 has 2 divisors, whose sum is σ = 71635599650. Its totient is φ = 71635599648.

The previous prime is 71635599631. The next prime is 71635599671. The reversal of 71635599649 is 94699553617.

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., 38872065600 + 32763534049 = 197160^2 + 181007^2 .

It is an emirp because it is prime and its reverse (94699553617) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71635599649 - 2⁹ = 71635599137 is a prime.

It is not a weakly prime, because it can be changed into another prime (71635594649) 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, 35817799824 + 35817799825.

It is an arithmetic number, because the mean of its divisors is an integer number (35817799825).

Almost surely, 2^71635599649 is an apocalyptic number.

It is an amenable number.

71635599649 is a deficient number, since it is larger than the sum of its proper divisors (1).

71635599649 is an equidigital number, since it uses as much as digits as its factorization.

71635599649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55112400, while the sum is 64.

The spelling of 71635599649 in words is "seventy-one billion, six hundred thirty-five million, five hundred ninety-nine thousand, six hundred forty-nine".