6643003481 has 2 divisors, whose sum is σ = 6643003482. Its totient is φ = 6643003480.

The previous prime is 6643003463. The next prime is 6643003513. The reversal of 6643003481 is 1843003466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3779790400 + 2863213081 = 61480^2 + 53509^2 .

It is a cyclic number.

It is not a de Polignac number, because 6643003481 - 2⁶ = 6643003417 is a prime.

It is a super-2 number, since 2×6643003481² = 88258990497156234722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6643003441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3321501740 + 3321501741.

It is an arithmetic number, because the mean of its divisors is an integer number (3321501741).

Almost surely, 2^6643003481 is an apocalyptic number.

It is an amenable number.

6643003481 is a deficient number, since it is larger than the sum of its proper divisors (1).

6643003481 is an equidigital number, since it uses as much as digits as its factorization.

6643003481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 6643003481 is about 81504.6224517358. The cubic root of 6643003481 is about 1879.8426268789.

The spelling of 6643003481 in words is "six billion, six hundred forty-three million, three thousand, four hundred eighty-one".