66214335005761 has 2 divisors, whose sum is σ = 66214335005762. Its totient is φ = 66214335005760.

The previous prime is 66214335005737. The next prime is 66214335005809. The reversal of 66214335005761 is 16750053341266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62263840873536 + 3950494132225 = 7890744^2 + 1987585^2 .

It is a cyclic number.

It is not a de Polignac number, because 66214335005761 - 2²¹ = 66214332908609 is a prime.

It is not a weakly prime, because it can be changed into another prime (66214335005561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33107167502880 + 33107167502881.

It is an arithmetic number, because the mean of its divisors is an integer number (33107167502881).

Almost surely, 2^{66214335005761} is an apocalyptic number.

It is an amenable number.

66214335005761 is a deficient number, since it is larger than the sum of its proper divisors (1).

66214335005761 is an equidigital number, since it uses as much as digits as its factorization.

66214335005761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2721600, while the sum is 49.

The spelling of 66214335005761 in words is "sixty-six trillion, two hundred fourteen billion, three hundred thirty-five million, five thousand, seven hundred sixty-one".