66583949 has 2 divisors, whose sum is σ = 66583950. Its totient is φ = 66583948.

The previous prime is 66583931. The next prime is 66583967. The reversal of 66583949 is 94938566.

It is a balanced prime because it is at equal distance from previous prime (66583931) and next prime (66583967).

It can be written as a sum of positive squares in only one way, i.e., 48580900 + 18003049 = 6970^2 + 4243^2 .

It is a cyclic number.

It is not a de Polignac number, because 66583949 - 2²⁰ = 65535373 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 = 66583897 and 66583906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66585949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33291974 + 33291975.

It is an arithmetic number, because the mean of its divisors is an integer number (33291975).

Almost surely, 2^66583949 is an apocalyptic number.

It is an amenable number.

66583949 is a deficient number, since it is larger than the sum of its proper divisors (1).

66583949 is an equidigital number, since it uses as much as digits as its factorization.

66583949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1399680, while the sum is 50.

The square root of 66583949 is about 8159.8988351572. The cubic root of 66583949 is about 405.3123617784.

The spelling of 66583949 in words is "sixty-six million, five hundred eighty-three thousand, nine hundred forty-nine".