66324749 has 2 divisors, whose sum is σ = 66324750. Its totient is φ = 66324748.

The previous prime is 66324743. The next prime is 66324773. The reversal of 66324749 is 94742366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65496649 + 828100 = 8093^2 + 910^2 .

It is a cyclic number.

It is not a de Polignac number, because 66324749 - 2⁴ = 66324733 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 (66324743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33162374 + 33162375.

It is an arithmetic number, because the mean of its divisors is an integer number (33162375).

Almost surely, 2^66324749 is an apocalyptic number.

It is an amenable number.

66324749 is a deficient number, since it is larger than the sum of its proper divisors (1).

66324749 is an equidigital number, since it uses as much as digits as its factorization.

66324749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 41.

The square root of 66324749 is about 8144.0007981336. Note that the first 3 decimals coincide. The cubic root of 66324749 is about 404.7857404514.

The spelling of 66324749 in words is "sixty-six million, three hundred twenty-four thousand, seven hundred forty-nine".