66460421 has 2 divisors, whose sum is σ = 66460422. Its totient is φ = 66460420.

The previous prime is 66460417. The next prime is 66460451. The reversal of 66460421 is 12406466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37149025 + 29311396 = 6095^2 + 5414^2 .

It is a cyclic number.

It is not a de Polignac number, because 66460421 - 2² = 66460417 is a prime.

It is equal to p_3921824 and since 66460421 and 3921824 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66460411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33230210 + 33230211.

It is an arithmetic number, because the mean of its divisors is an integer number (33230211).

Almost surely, 2^66460421 is an apocalyptic number.

It is an amenable number.

66460421 is a deficient number, since it is larger than the sum of its proper divisors (1).

66460421 is an equidigital number, since it uses as much as digits as its factorization.

66460421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 66460421 is about 8152.3261097677. The cubic root of 66460421 is about 405.0615584933.

Adding to 66460421 its reverse (12406466), we get a palindrome (78866887).

The spelling of 66460421 in words is "sixty-six million, four hundred sixty thousand, four hundred twenty-one".