66649012973 has 2 divisors, whose sum is σ = 66649012974. Its totient is φ = 66649012972.

The previous prime is 66649012967. The next prime is 66649013023. The reversal of 66649012973 is 37921094666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50177344009 + 16471668964 = 224003^2 + 128342^2 .

It is a cyclic number.

It is not a de Polignac number, because 66649012973 - 2²⁴ = 66632235757 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66649011973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33324506486 + 33324506487.

It is an arithmetic number, because the mean of its divisors is an integer number (33324506487).

Almost surely, 2^66649012973 is an apocalyptic number.

It is an amenable number.

66649012973 is a deficient number, since it is larger than the sum of its proper divisors (1).

66649012973 is an equidigital number, since it uses as much as digits as its factorization.

66649012973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2939328, while the sum is 53.

The spelling of 66649012973 in words is "sixty-six billion, six hundred forty-nine million, twelve thousand, nine hundred seventy-three".