66431303 has 2 divisors, whose sum is σ = 66431304. Its totient is φ = 66431302.

The previous prime is 66431273. The next prime is 66431311. The reversal of 66431303 is 30313466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66431303 - 2²⁰ = 65382727 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66431333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33215651 + 33215652.

It is an arithmetic number, because the mean of its divisors is an integer number (33215652).

Almost surely, 2^66431303 is an apocalyptic number.

66431303 is a deficient number, since it is larger than the sum of its proper divisors (1).

66431303 is an equidigital number, since it uses as much as digits as its factorization.

66431303 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 26.

The square root of 66431303 is about 8150.5400434572. The cubic root of 66431303 is about 405.0023939299.

Adding to 66431303 its reverse (30313466), we get a palindrome (96744769).

The spelling of 66431303 in words is "sixty-six million, four hundred thirty-one thousand, three hundred three".