6661733647 has 4 divisors (see below), whose sum is σ = 6661961856. Its totient is φ = 6661505440.

The previous prime is 6661733609. The next prime is 6661733657. The reversal of 6661733647 is 7463371666.

6661733647 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6661733647 - 2²⁷ = 6527515919 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6661733647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661733657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62554 + ... + 131287.

It is an arithmetic number, because the mean of its divisors is an integer number (1665490464).

Almost surely, 2^6661733647 is an apocalyptic number.

6661733647 is a deficient number, since it is larger than the sum of its proper divisors (228209).

6661733647 is a wasteful number, since it uses less digits than its factorization.

6661733647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228208.

The product of its digits is 2286144, while the sum is 49.

The square root of 6661733647 is about 81619.4440498096. Note that the first 3 decimals coincide. The cubic root of 6661733647 is about 1881.6077282921.

The spelling of 6661733647 in words is "six billion, six hundred sixty-one million, seven hundred thirty-three thousand, six hundred forty-seven".