66784504711469 has 2 divisors, whose sum is σ = 66784504711470. Its totient is φ = 66784504711468.

The previous prime is 66784504711433. The next prime is 66784504711523. The reversal of 66784504711469 is 96411740548766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42645314394244 + 24139190317225 = 6530338^2 + 4913165^2 .

It is a cyclic number.

It is not a de Polignac number, because 66784504711469 - 2²⁰ = 66784503662893 is a prime.

It is a super-2 number, since 2×66784504711469² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66784504711399 and 66784504711408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66784504711069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33392252355734 + 33392252355735.

It is an arithmetic number, because the mean of its divisors is an integer number (33392252355735).

Almost surely, 2^{66784504711469} is an apocalyptic number.

It is an amenable number.

66784504711469 is a deficient number, since it is larger than the sum of its proper divisors (1).

66784504711469 is an equidigital number, since it uses as much as digits as its factorization.

66784504711469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 243855360, while the sum is 68.

The spelling of 66784504711469 in words is "sixty-six trillion, seven hundred eighty-four billion, five hundred four million, seven hundred eleven thousand, four hundred sixty-nine".