6640990466 has 32 divisors (see below), whose sum is σ = 12111923520. Its totient is φ = 2691532800.

The previous prime is 6640990453. The next prime is 6640990511.

It is a happy number.

6640990466 is nontrivially palindromic in base 10.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 460175 + ... + 474386.

It is an arithmetic number, because the mean of its divisors is an integer number (378497610).

Almost surely, 2^6640990466 is an apocalyptic number.

6640990466 is a deficient number, since it is larger than the sum of its proper divisors (5470933054).

6640990466 is a wasteful number, since it uses less digits than its factorization.

6640990466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 934610.

The product of its (nonzero) digits is 1679616, while the sum is 50.

The square root of 6640990466 is about 81492.2724311944. The cubic root of 6640990466 is about 1879.6527261452.

The spelling of 6640990466 in words is "six billion, six hundred forty million, nine hundred ninety thousand, four hundred sixty-six".