81753672449 has 2 divisors, whose sum is σ = 81753672450. Its totient is φ = 81753672448.

The previous prime is 81753672419. The next prime is 81753672487. The reversal of 81753672449 is 94427635718.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74892532225 + 6861140224 = 273665^2 + 82832^2 .

It is a cyclic number.

It is not a de Polignac number, because 81753672449 - 2³² = 77458705153 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81753672394 and 81753672403.

It is not a weakly prime, because it can be changed into another prime (81753672419) 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, 40876836224 + 40876836225.

It is an arithmetic number, because the mean of its divisors is an integer number (40876836225).

Almost surely, 2^81753672449 is an apocalyptic number.

It is an amenable number.

81753672449 is a deficient number, since it is larger than the sum of its proper divisors (1).

81753672449 is an equidigital number, since it uses as much as digits as its factorization.

81753672449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10160640, while the sum is 56.

The spelling of 81753672449 in words is "eighty-one billion, seven hundred fifty-three million, six hundred seventy-two thousand, four hundred forty-nine".