6646556466 has 64 divisors (see below), whose sum is σ = 16130672640. Its totient is φ = 2011882320.

The previous prime is 6646556437. The next prime is 6646556471.

6646556466 is a `hidden beast` number, since 6 + 6 + 46 + 556 + 46 + 6 = 666.

6646556466 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 578211 + ... + 589593.

It is an arithmetic number, because the mean of its divisors is an integer number (252041760).

Almost surely, 2^6646556466 is an apocalyptic number.

6646556466 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 6646556466, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8065336320).

6646556466 is an abundant number, since it is smaller than the sum of its proper divisors (9484116174).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6646556466 is a wasteful number, since it uses less digits than its factorization.

6646556466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12388 (or 12382 counting only the distinct ones).

The product of its digits is 18662400, while the sum is 54.

The square root of 6646556466 is about 81526.4157558763. The cubic root of 6646556466 is about 1880.1777093594.

The spelling of 6646556466 in words is "six billion, six hundred forty-six million, five hundred fifty-six thousand, four hundred sixty-six".