81762553489 has 2 divisors, whose sum is σ = 81762553490. Its totient is φ = 81762553488.

The previous prime is 81762553471. The next prime is 81762553501. The reversal of 81762553489 is 98435526718.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81671923089 + 90630400 = 285783^2 + 9520^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81762553489 is a prime.

It is not a weakly prime, because it can be changed into another prime (81762553889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40881276744 + 40881276745.

It is an arithmetic number, because the mean of its divisors is an integer number (40881276745).

Almost surely, 2^81762553489 is an apocalyptic number.

It is an amenable number.

81762553489 is a deficient number, since it is larger than the sum of its proper divisors (1).

81762553489 is an equidigital number, since it uses as much as digits as its factorization.

81762553489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14515200, while the sum is 58.

The spelling of 81762553489 in words is "eighty-one billion, seven hundred sixty-two million, five hundred fifty-three thousand, four hundred eighty-nine".