75564765481 has 2 divisors, whose sum is σ = 75564765482. Its totient is φ = 75564765480.

The previous prime is 75564765469. The next prime is 75564765527. The reversal of 75564765481 is 18456746557.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55545062400 + 20019703081 = 235680^2 + 141491^2 .

It is an emirp because it is prime and its reverse (18456746557) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 75564765481 - 2¹¹ = 75564763433 is a prime.

It is a super-2 number, since 2×75564765481² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (75564765181) 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, 37782382740 + 37782382741.

It is an arithmetic number, because the mean of its divisors is an integer number (37782382741).

Almost surely, 2^75564765481 is an apocalyptic number.

It is an amenable number.

75564765481 is a deficient number, since it is larger than the sum of its proper divisors (1).

75564765481 is an equidigital number, since it uses as much as digits as its factorization.

75564765481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224000, while the sum is 58.

It can be divided in two parts, 755647 and 65481, that added together give a palindrome (821128).

The spelling of 75564765481 in words is "seventy-five billion, five hundred sixty-four million, seven hundred sixty-five thousand, four hundred eighty-one".