66555199 has 2 divisors, whose sum is σ = 66555200. Its totient is φ = 66555198.

The previous prime is 66555107. The next prime is 66555241. The reversal of 66555199 is 99155566.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66555199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66555299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33277599 + 33277600.

It is an arithmetic number, because the mean of its divisors is an integer number (33277600).

Almost surely, 2^66555199 is an apocalyptic number.

66555199 is a deficient number, since it is larger than the sum of its proper divisors (1).

66555199 is an equidigital number, since it uses as much as digits as its factorization.

66555199 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 364500, while the sum is 46.

The square root of 66555199 is about 8158.1369809534. The cubic root of 66555199 is about 405.2540173469.

The spelling of 66555199 in words is "sixty-six million, five hundred fifty-five thousand, one hundred ninety-nine".