75681743849 has 2 divisors, whose sum is σ = 75681743850. Its totient is φ = 75681743848.

The previous prime is 75681743827. The next prime is 75681743857. The reversal of 75681743849 is 94834718657.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38314147600 + 37367596249 = 195740^2 + 193307^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75681743849 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 75681743791 and 75681743800.

It is not a weakly prime, because it can be changed into another prime (75681745849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37840871924 + 37840871925.

It is an arithmetic number, because the mean of its divisors is an integer number (37840871925).

Almost surely, 2^75681743849 is an apocalyptic number.

It is an amenable number.

75681743849 is a deficient number, since it is larger than the sum of its proper divisors (1).

75681743849 is an equidigital number, since it uses as much as digits as its factorization.

75681743849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40642560, while the sum is 62.

The spelling of 75681743849 in words is "seventy-five billion, six hundred eighty-one million, seven hundred forty-three thousand, eight hundred forty-nine".