6640266650 has 48 divisors (see below), whose sum is σ = 12990025728. Its totient is φ = 2521896000.

The previous prime is 6640266649. The next prime is 6640266653. The reversal of 6640266650 is 566620466.

It is a junction number, because it is equal to n+sod(n) for n = 6640266598 and 6640266607.

It is not an unprimeable number, because it can be changed into a prime (6640266653) 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, 41735 + ... + 122565.

It is an arithmetic number, because the mean of its divisors is an integer number (270625536).

Almost surely, 2^6640266650 is an apocalyptic number.

6640266650 is a deficient number, since it is larger than the sum of its proper divisors (6349759078).

6640266650 is a wasteful number, since it uses less digits than its factorization.

6640266650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80927 (or 80922 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 41.

The square root of 6640266650 is about 81487.8313001395. The cubic root of 6640266650 is about 1879.5844345173.

The spelling of 6640266650 in words is "six billion, six hundred forty million, two hundred sixty-six thousand, six hundred fifty".