6640726016 has 52 divisors (see below), whose sum is σ = 13314830904. Its totient is φ = 3311616000.

The previous prime is 6640726013. The next prime is 6640726069. The reversal of 6640726016 is 6106270466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640726013) 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, 1722491 + ... + 1726341.

Almost surely, 2^6640726016 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 6640726016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6657415452).

6640726016 is an abundant number, since it is smaller than the sum of its proper divisors (6674104888).

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

6640726016 is an equidigital number, since it uses as much as digits as its factorization.

6640726016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4296 (or 4274 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 6640726016 is about 81490.6498685585. The cubic root of 6640726016 is about 1879.6277760134.

The spelling of 6640726016 in words is "six billion, six hundred forty million, seven hundred twenty-six thousand, sixteen".