66683549 has 2 divisors, whose sum is σ = 66683550. Its totient is φ = 66683548.

The previous prime is 66683527. The next prime is 66683567. The reversal of 66683549 is 94538666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48748324 + 17935225 = 6982^2 + 4235^2 .

It is a cyclic number.

It is not a de Polignac number, because 66683549 - 2²⁴ = 49906333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66683569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33341774 + 33341775.

It is an arithmetic number, because the mean of its divisors is an integer number (33341775).

Almost surely, 2^66683549 is an apocalyptic number.

It is an amenable number.

66683549 is a deficient number, since it is larger than the sum of its proper divisors (1).

66683549 is an equidigital number, since it uses as much as digits as its factorization.

66683549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 933120, while the sum is 47.

The square root of 66683549 is about 8165.9995713936. Note that the first 3 decimals coincide. The cubic root of 66683549 is about 405.5143574033.

The spelling of 66683549 in words is "sixty-six million, six hundred eighty-three thousand, five hundred forty-nine".