66304531 has 2 divisors, whose sum is σ = 66304532. Its totient is φ = 66304530.

The previous prime is 66304519. The next prime is 66304549. The reversal of 66304531 is 13540366.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66304531 - 2⁹ = 66304019 is a prime.

It is a super-2 number, since 2×66304531² = 8792581662259922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66304531.

It is not a weakly prime, because it can be changed into another prime (66304501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33152265 + 33152266.

It is an arithmetic number, because the mean of its divisors is an integer number (33152266).

Almost surely, 2^66304531 is an apocalyptic number.

66304531 is a deficient number, since it is larger than the sum of its proper divisors (1).

66304531 is an equidigital number, since it uses as much as digits as its factorization.

66304531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 66304531 is about 8142.7594217194. The cubic root of 66304531 is about 404.7446055310.

Adding to 66304531 its reverse (13540366), we get a palindrome (79844897).

The spelling of 66304531 in words is "sixty-six million, three hundred four thousand, five hundred thirty-one".