55666939 has 2 divisors, whose sum is σ = 55666940. Its totient is φ = 55666938.

The previous prime is 55666909. The next prime is 55666967. The reversal of 55666939 is 93966655.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55666939 - 2⁹ = 55666427 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 55666892 and 55666901.

It is not a weakly prime, because it can be changed into another prime (55666909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27833469 + 27833470.

It is an arithmetic number, because the mean of its divisors is an integer number (27833470).

Almost surely, 2^55666939 is an apocalyptic number.

55666939 is a deficient number, since it is larger than the sum of its proper divisors (1).

55666939 is an equidigital number, since it uses as much as digits as its factorization.

55666939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1312200, while the sum is 49.

The square root of 55666939 is about 7461.0280122782. The cubic root of 55666939 is about 381.8262483849.

The spelling of 55666939 in words is "fifty-five million, six hundred sixty-six thousand, nine hundred thirty-nine".