6643370461 has 64 divisors (see below), whose sum is σ = 8711180800. Its totient is φ = 5029516800.

The previous prime is 6643370443. The next prime is 6643370473. The reversal of 6643370461 is 1640733466.

It is a happy number.

It is not a de Polignac number, because 6643370461 - 2⁷ = 6643370333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6643370411) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11053561 + ... + 11054161.

It is an arithmetic number, because the mean of its divisors is an integer number (136112200).

Almost surely, 2^6643370461 is an apocalyptic number.

It is an amenable number.

6643370461 is a deficient number, since it is larger than the sum of its proper divisors (2067810339).

6643370461 is a wasteful number, since it uses less digits than its factorization.

6643370461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 739 (or 725 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 40.

The square root of 6643370461 is about 81506.8737040012. The cubic root of 6643370461 is about 1879.8772423429.

The spelling of 6643370461 in words is "six billion, six hundred forty-three million, three hundred seventy thousand, four hundred sixty-one".