66218903 has 2 divisors, whose sum is σ = 66218904. Its totient is φ = 66218902.

The previous prime is 66218897. The next prime is 66218921. The reversal of 66218903 is 30981266.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66218903 is a prime.

It is a super-2 number, since 2×66218903² = 8769886229046818, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66218963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33109451 + 33109452.

It is an arithmetic number, because the mean of its divisors is an integer number (33109452).

Almost surely, 2^66218903 is an apocalyptic number.

66218903 is a deficient number, since it is larger than the sum of its proper divisors (1).

66218903 is an equidigital number, since it uses as much as digits as its factorization.

66218903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 66218903 is about 8137.4998003072. The cubic root of 66218903 is about 404.5702966737.

The spelling of 66218903 in words is "sixty-six million, two hundred eighteen thousand, nine hundred three".