6664481 has 2 divisors, whose sum is σ = 6664482. Its totient is φ = 6664480.

The previous prime is 6664453. The next prime is 6664501. The reversal of 6664481 is 1844666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6630625 + 33856 = 2575^2 + 184^2 .

It is a cyclic number.

It is not a de Polignac number, because 6664481 - 2⁶ = 6664417 is a prime.

It is a super-2 number, since 2×6664481² = 88830613998722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6664381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3332240 + 3332241.

It is an arithmetic number, because the mean of its divisors is an integer number (3332241).

Almost surely, 2^6664481 is an apocalyptic number.

It is an amenable number.

6664481 is a deficient number, since it is larger than the sum of its proper divisors (1).

6664481 is an equidigital number, since it uses as much as digits as its factorization.

6664481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 35.

The square root of 6664481 is about 2581.5656102451. The cubic root of 6664481 is about 188.1866356173.

The spelling of 6664481 in words is "six million, six hundred sixty-four thousand, four hundred eighty-one".