6640660466 has 16 divisors (see below), whose sum is σ = 10901487168. Its totient is φ = 3008773200.

The previous prime is 6640660457. The next prime is 6640660501.

6640660466 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 478445 + ... + 492128.

It is an arithmetic number, because the mean of its divisors is an integer number (681342948).

Almost surely, 2^6640660466 is an apocalyptic number.

6640660466 is a deficient number, since it is larger than the sum of its proper divisors (4260826702).

6640660466 is a wasteful number, since it uses less digits than its factorization.

6640660466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 970897.

The product of its (nonzero) digits is 746496, while the sum is 44.

The square root of 6640660466 is about 81490.2476741849. The cubic root of 6640660466 is about 1879.6215914484.

The spelling of 6640660466 in words is "six billion, six hundred forty million, six hundred sixty thousand, four hundred sixty-six".