66674006669 has 2 divisors, whose sum is σ = 66674006670. Its totient is φ = 66674006668.

The previous prime is 66674006611. The next prime is 66674006687. The reversal of 66674006669 is 96660047666.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53888051044 + 12785955625 = 232138^2 + 113075^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66674006669 is a prime.

It is a super-2 number, since 2×66674006669² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66674006699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33337003334 + 33337003335.

It is an arithmetic number, because the mean of its divisors is an integer number (33337003335).

Almost surely, 2^66674006669 is an apocalyptic number.

It is an amenable number.

66674006669 is a deficient number, since it is larger than the sum of its proper divisors (1).

66674006669 is an equidigital number, since it uses as much as digits as its factorization.

66674006669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11757312, while the sum is 56.

The spelling of 66674006669 in words is "sixty-six billion, six hundred seventy-four million, six thousand, six hundred sixty-nine".