6640350651 has 24 divisors (see below), whose sum is σ = 10813187280. Its totient is φ = 4024452960.

The previous prime is 6640350601. The next prime is 6640350667. The reversal of 6640350651 is 1560530466.

6640350651 is a `hidden beast` number, since 6 + 640 + 3 + 5 + 0 + 6 + 5 + 1 = 666.

It is not a de Polignac number, because 6640350651 - 2¹⁹ = 6639826363 is a prime.

It is a super-3 number, since 3×6640350651³ (a number of 30 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (6640350601) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1013010 + ... + 1019543.

It is an arithmetic number, because the mean of its divisors is an integer number (450549470).

Almost surely, 2^6640350651 is an apocalyptic number.

6640350651 is a deficient number, since it is larger than the sum of its proper divisors (4172836629).

6640350651 is a wasteful number, since it uses less digits than its factorization.

6640350651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2032584 (or 2032567 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 6640350651 is about 81488.3467190248. The cubic root of 6640350651 is about 1879.5923602184.

The spelling of 6640350651 in words is "six billion, six hundred forty million, three hundred fifty thousand, six hundred fifty-one".