6635651668 has 6 divisors (see below), whose sum is σ = 11612390426. Its totient is φ = 3317825832.

The previous prime is 6635651651. The next prime is 6635651699. The reversal of 6635651668 is 8661565366.

It can be written as a sum of positive squares in only one way, i.e., 3737121424 + 2898530244 = 61132^2 + 53838^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 829456455 + ... + 829456462.

Almost surely, 2^6635651668 is an apocalyptic number.

It is an amenable number.

6635651668 is a deficient number, since it is larger than the sum of its proper divisors (4976738758).

6635651668 is a wasteful number, since it uses less digits than its factorization.

6635651668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1658912921 (or 1658912919 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 52.

The square root of 6635651668 is about 81459.5093773588. The cubic root of 6635651668 is about 1879.1488968550.

The spelling of 6635651668 in words is "six billion, six hundred thirty-five million, six hundred fifty-one thousand, six hundred sixty-eight".