6641974666 has 16 divisors (see below), whose sum is σ = 10495800000. Its totient is φ = 3143657088.

The previous prime is 6641974649. The next prime is 6641974667. The reversal of 6641974666 is 6664791466.

It is not an unprimeable number, because it can be changed into a prime (6641974667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22510 + ... + 117433.

It is an arithmetic number, because the mean of its divisors is an integer number (655987500).

Almost surely, 2^6641974666 is an apocalyptic number.

6641974666 is a deficient number, since it is larger than the sum of its proper divisors (3853825334).

6641974666 is a wasteful number, since it uses less digits than its factorization.

6641974666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141213.

The product of its digits is 7838208, while the sum is 55.

The square root of 6641974666 is about 81498.3108168507. The cubic root of 6641974666 is about 1879.7455768950.

The spelling of 6641974666 in words is "six billion, six hundred forty-one million, nine hundred seventy-four thousand, six hundred sixty-six".