66304489 has 2 divisors, whose sum is σ = 66304490. Its totient is φ = 66304488.

The previous prime is 66304457. The next prime is 66304493. The reversal of 66304489 is 98440366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53772889 + 12531600 = 7333^2 + 3540^2 .

It is a cyclic number.

It is not a de Polignac number, because 66304489 - 2⁵ = 66304457 is a prime.

It is a super-2 number, since 2×66304489² = 8792570523102242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66304439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33152244 + 33152245.

It is an arithmetic number, because the mean of its divisors is an integer number (33152245).

Almost surely, 2^66304489 is an apocalyptic number.

It is an amenable number.

66304489 is a deficient number, since it is larger than the sum of its proper divisors (1).

66304489 is an equidigital number, since it uses as much as digits as its factorization.

66304489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 40.

The square root of 66304489 is about 8142.7568427407. The cubic root of 66304489 is about 404.7445200704.

The spelling of 66304489 in words is "sixty-six million, three hundred four thousand, four hundred eighty-nine".