81758437753 has 2 divisors, whose sum is σ = 81758437754. Its totient is φ = 81758437752.

The previous prime is 81758437721. The next prime is 81758437757. The reversal of 81758437753 is 35773485718.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70345361529 + 11413076224 = 265227^2 + 106832^2 .

It is a cyclic number.

It is not a de Polignac number, because 81758437753 - 2⁵ = 81758437721 is a prime.

It is a super-2 number, since 2×81758437753² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81758437757) 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, 40879218876 + 40879218877.

It is an arithmetic number, because the mean of its divisors is an integer number (40879218877).

Almost surely, 2^81758437753 is an apocalyptic number.

It is an amenable number.

81758437753 is a deficient number, since it is larger than the sum of its proper divisors (1).

81758437753 is an equidigital number, since it uses as much as digits as its factorization.

81758437753 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19756800, while the sum is 58.

The spelling of 81758437753 in words is "eighty-one billion, seven hundred fifty-eight million, four hundred thirty-seven thousand, seven hundred fifty-three".