33666649 has 2 divisors, whose sum is σ = 33666650. Its totient is φ = 33666648.

The previous prime is 33666599. The next prime is 33666667. The reversal of 33666649 is 94666633.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31584400 + 2082249 = 5620^2 + 1443^2 .

It is an emirp because it is prime and its reverse (94666633) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33666649 is a prime.

It is a super-2 number, since 2×33666649² = 2266886509778402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (33666349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16833324 + 16833325.

It is an arithmetic number, because the mean of its divisors is an integer number (16833325).

Almost surely, 2^33666649 is an apocalyptic number.

It is an amenable number.

33666649 is a deficient number, since it is larger than the sum of its proper divisors (1).

33666649 is an equidigital number, since it uses as much as digits as its factorization.

33666649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 419904, while the sum is 43.

The square root of 33666649 is about 5802.2968727910. The cubic root of 33666649 is about 322.8989482187.

The spelling of 33666649 in words is "thirty-three million, six hundred sixty-six thousand, six hundred forty-nine".