66935381732413 has 2 divisors, whose sum is σ = 66935381732414. Its totient is φ = 66935381732412.

The previous prime is 66935381732377. The next prime is 66935381732431. The reversal of 66935381732413 is 31423718353966.

Together with next prime (66935381732431) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39957101672569 + 26978280059844 = 6321163^2 + 5194062^2 .

It is a cyclic number.

It is not a de Polignac number, because 66935381732413 - 2²¹ = 66935379635261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66935381732473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33467690866206 + 33467690866207.

It is an arithmetic number, because the mean of its divisors is an integer number (33467690866207).

Almost surely, 2^{66935381732413} is an apocalyptic number.

It is an amenable number.

66935381732413 is a deficient number, since it is larger than the sum of its proper divisors (1).

66935381732413 is an equidigital number, since it uses as much as digits as its factorization.

66935381732413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58786560, while the sum is 61.

The spelling of 66935381732413 in words is "sixty-six trillion, nine hundred thirty-five billion, three hundred eighty-one million, seven hundred thirty-two thousand, four hundred thirteen".