6646220036 has 6 divisors (see below), whose sum is σ = 11630885070. Its totient is φ = 3323110016.

The previous prime is 6646220027. The next prime is 6646220069. The reversal of 6646220036 is 6300226466.

It can be written as a sum of positive squares in only one way, i.e., 4768731136 + 1877488900 = 69056^2 + 43330^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6646219978 and 6646220005.

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, 830777501 + ... + 830777508.

It is an arithmetic number, because the mean of its divisors is an integer number (1938480845).

Almost surely, 2^6646220036 is an apocalyptic number.

It is an amenable number.

6646220036 is a deficient number, since it is larger than the sum of its proper divisors (4984665034).

6646220036 is a wasteful number, since it uses less digits than its factorization.

6646220036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1661555013 (or 1661555011 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 35.

The square root of 6646220036 is about 81524.3524107981. The cubic root of 6646220036 is about 1880.1459857211.

The spelling of 6646220036 in words is "six billion, six hundred forty-six million, two hundred twenty thousand, thirty-six".