9966650 has 24 divisors (see below), whose sum is σ = 18892764. Its totient is φ = 3910400.

The previous prime is 9966643. The next prime is 9966667. The reversal of 9966650 is 566699.

It is a Cunningham number, because it is equal to 3157²+1.

It can be written as a sum of positive squares in 6 ways, for example, as 4439449 + 5527201 = 2107^2 + 2351^2 .

It is a super-2 number, since 2×9966650² = 198668224445000, which contains 22 as substring.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 9966598 and 9966607.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 770 + ... + 4530.

Almost surely, 2^9966650 is an apocalyptic number.

9966650 is a deficient number, since it is larger than the sum of its proper divisors (8926114).

9966650 is a wasteful number, since it uses less digits than its factorization.

9966650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3826 (or 3821 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 41.

The square root of 9966650 is about 3157.0001583782. Note that the first 3 decimals coincide. The cubic root of 9966650 is about 215.2037009401.

The spelling of 9966650 in words is "nine million, nine hundred sixty-six thousand, six hundred fifty".