75985309365613 has 2 divisors, whose sum is σ = 75985309365614. Its totient is φ = 75985309365612.

The previous prime is 75985309365611. The next prime is 75985309365631. The reversal of 75985309365613 is 31656390358957.

Together with next prime (75985309365631) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58162617579364 + 17822691786249 = 7626442^2 + 4221693^2 .

It is a cyclic number.

It is not a de Polignac number, because 75985309365613 - 2¹ = 75985309365611 is a prime.

Together with 75985309365611, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75985309365611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37992654682806 + 37992654682807.

It is an arithmetic number, because the mean of its divisors is an integer number (37992654682807).

Almost surely, 2^{75985309365613} is an apocalyptic number.

It is an amenable number.

75985309365613 is a deficient number, since it is larger than the sum of its proper divisors (1).

75985309365613 is an equidigital number, since it uses as much as digits as its factorization.

75985309365613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 551124000, while the sum is 70.

The spelling of 75985309365613 in words is "seventy-five trillion, nine hundred eighty-five billion, three hundred nine million, three hundred sixty-five thousand, six hundred thirteen".