6644136264 has 64 divisors (see below), whose sum is σ = 17255306880. Its totient is φ = 2130240000.

The previous prime is 6644136229. The next prime is 6644136281. The reversal of 6644136264 is 4626314466.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22314 + ... + 117414.

It is an arithmetic number, because the mean of its divisors is an integer number (269614170).

Almost surely, 2^6644136264 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 6644136264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8627653440).

6644136264 is an abundant number, since it is smaller than the sum of its proper divisors (10611170616).

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

6644136264 is a wasteful number, since it uses less digits than its factorization.

6644136264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95222 (or 95218 counting only the distinct ones).

The product of its digits is 497664, while the sum is 42.

The square root of 6644136264 is about 81511.5713503304. The cubic root of 6644136264 is about 1879.9494727631.

The spelling of 6644136264 in words is "six billion, six hundred forty-four million, one hundred thirty-six thousand, two hundred sixty-four".