6647776164 has 96 divisors (see below), whose sum is σ = 18215769600. Its totient is φ = 2090772000.

The previous prime is 6647776159. The next prime is 6647776217. The reversal of 6647776164 is 4616777466.

6647776164 is a `hidden beast` number, since 6 + 6 + 477 + 7 + 6 + 164 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 6647776164.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 508599 + ... + 521505.

It is an arithmetic number, because the mean of its divisors is an integer number (189747600).

Almost surely, 2^6647776164 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6647776164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9107884800).

6647776164 is an abundant number, since it is smaller than the sum of its proper divisors (11567993436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6647776164 is a wasteful number, since it uses less digits than its factorization.

6647776164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13190 (or 13182 counting only the distinct ones).

The product of its digits is 7112448, while the sum is 54.

The square root of 6647776164 is about 81533.8957980054. The cubic root of 6647776164 is about 1880.2927117039.

The spelling of 6647776164 in words is "six billion, six hundred forty-seven million, seven hundred seventy-six thousand, one hundred sixty-four".