6721340164 has 96 divisors (see below), whose sum is σ = 14892595200. Its totient is φ = 2578287360.

The previous prime is 6721340161. The next prime is 6721340203. The reversal of 6721340164 is 4610431276.

It is not an unprimeable number, because it can be changed into a prime (6721340161) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 9840567 + ... + 9841249.

It is an arithmetic number, because the mean of its divisors is an integer number (155131200).

Almost surely, 2^6721340164 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 6721340164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7446297600).

6721340164 is an abundant number, since it is smaller than the sum of its proper divisors (8171255036).

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

6721340164 is a wasteful number, since it uses less digits than its factorization.

6721340164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1153 (or 1151 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 6721340164 is about 81983.7798835843. The cubic root of 6721340164 is about 1887.2030298922.

The spelling of 6721340164 in words is "six billion, seven hundred twenty-one million, three hundred forty thousand, one hundred sixty-four".