66450203 has 2 divisors, whose sum is σ = 66450204. Its totient is φ = 66450202.

The previous prime is 66450193. The next prime is 66450211. The reversal of 66450203 is 30205466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66450203 - 2²² = 62255899 is a prime.

It is a super-4 number, since 4×66450203⁴ (a number of 32 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (66450253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33225101 + 33225102.

It is an arithmetic number, because the mean of its divisors is an integer number (33225102).

Almost surely, 2^66450203 is an apocalyptic number.

66450203 is a deficient number, since it is larger than the sum of its proper divisors (1).

66450203 is an equidigital number, since it uses as much as digits as its factorization.

66450203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 66450203 is about 8151.6993933780. The cubic root of 66450203 is about 405.0407986131.

Adding to 66450203 its reverse (30205466), we get a palindrome (96655669).

The spelling of 66450203 in words is "sixty-six million, four hundred fifty thousand, two hundred three".