6616001666 has 32 divisors (see below), whose sum is σ = 10545552000. Its totient is φ = 3104255232.

The previous prime is 6616001657. The next prime is 6616001669. The reversal of 6616001666 is 6661006166.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is not an unprimeable number, because it can be changed into a prime (6616001669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2140250 + ... + 2143338.

It is an arithmetic number, because the mean of its divisors is an integer number (329548500).

Almost surely, 2^6616001666 is an apocalyptic number.

6616001666 is a deficient number, since it is larger than the sum of its proper divisors (3929550334).

6616001666 is a wasteful number, since it uses less digits than its factorization.

6616001666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3626.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 6616001666 is about 81338.8078717656. The cubic root of 6616001666 is about 1877.2921694793.

The spelling of 6616001666 in words is "six billion, six hundred sixteen million, one thousand, six hundred sixty-six".