75664744781 has 2 divisors, whose sum is σ = 75664744782. Its totient is φ = 75664744780.

The previous prime is 75664744747. The next prime is 75664744787. The reversal of 75664744781 is 18744746657.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62570519881 + 13094224900 = 250141^2 + 114430^2 .

It is a cyclic number.

It is not a de Polignac number, because 75664744781 - 2⁶ = 75664744717 is a prime.

It is a super-2 number, since 2×75664744781² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 75664744781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75664744787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37832372390 + 37832372391.

It is an arithmetic number, because the mean of its divisors is an integer number (37832372391).

Almost surely, 2^75664744781 is an apocalyptic number.

It is an amenable number.

75664744781 is a deficient number, since it is larger than the sum of its proper divisors (1).

75664744781 is an equidigital number, since it uses as much as digits as its factorization.

75664744781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31610880, while the sum is 59.

The spelling of 75664744781 in words is "seventy-five billion, six hundred sixty-four million, seven hundred forty-four thousand, seven hundred eighty-one".