66460321 has 2 divisors, whose sum is σ = 66460322. Its totient is φ = 66460320.

The previous prime is 66460319. The next prime is 66460337. The reversal of 66460321 is 12306466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38750625 + 27709696 = 6225^2 + 5264^2 .

It is a cyclic number.

It is not a de Polignac number, because 66460321 - 2¹ = 66460319 is a prime.

Together with 66460319, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 66460321.

It is not a weakly prime, because it can be changed into another prime (66460301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33230160 + 33230161.

It is an arithmetic number, because the mean of its divisors is an integer number (33230161).

Almost surely, 2^66460321 is an apocalyptic number.

It is an amenable number.

66460321 is a deficient number, since it is larger than the sum of its proper divisors (1).

66460321 is an equidigital number, since it uses as much as digits as its factorization.

66460321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 66460321 is about 8152.3199765466. The cubic root of 66460321 is about 405.0613553339.

Adding to 66460321 its reverse (12306466), we get a palindrome (78766787).

The spelling of 66460321 in words is "sixty-six million, four hundred sixty thousand, three hundred twenty-one".