75811811857 has 2 divisors, whose sum is σ = 75811811858. Its totient is φ = 75811811856.

The previous prime is 75811811843. The next prime is 75811811869.

75811811857 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74247530256 + 1564281601 = 272484^2 + 39551^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 75811811857 - 2¹⁹ = 75811287569 is a prime.

It is not a weakly prime, because it can be changed into another prime (75811811837) 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, 37905905928 + 37905905929.

It is an arithmetic number, because the mean of its divisors is an integer number (37905905929).

Almost surely, 2^75811811857 is an apocalyptic number.

It is an amenable number.

75811811857 is a deficient number, since it is larger than the sum of its proper divisors (1).

75811811857 is an equidigital number, since it uses as much as digits as its factorization.

75811811857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 627200, while the sum is 52.

The spelling of 75811811857 in words is "seventy-five billion, eight hundred eleven million, eight hundred eleven thousand, eight hundred fifty-seven".