66411535649 has 2 divisors, whose sum is σ = 66411535650. Its totient is φ = 66411535648.

The previous prime is 66411535537. The next prime is 66411535667. The reversal of 66411535649 is 94653511466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58971265600 + 7440270049 = 242840^2 + 86257^2 .

It is a cyclic number.

It is not a de Polignac number, because 66411535649 - 2¹⁶ = 66411470113 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 = 66411535597 and 66411535606.

It is not a weakly prime, because it can be changed into another prime (66411535699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33205767824 + 33205767825.

It is an arithmetic number, because the mean of its divisors is an integer number (33205767825).

Almost surely, 2^66411535649 is an apocalyptic number.

It is an amenable number.

66411535649 is a deficient number, since it is larger than the sum of its proper divisors (1).

66411535649 is an equidigital number, since it uses as much as digits as its factorization.

66411535649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2332800, while the sum is 50.

The spelling of 66411535649 in words is "sixty-six billion, four hundred eleven million, five hundred thirty-five thousand, six hundred forty-nine".