6639740160 has 144 divisors (see below), whose sum is σ = 21258417600. Its totient is φ = 1766195200.

The previous prime is 6639740089. The next prime is 6639740179. The reversal of 6639740160 is 610479366.

It is a super-2 number, since 2×6639740160² = 88172298784633651200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1722235 + ... + 1726085.

It is an arithmetic number, because the mean of its divisors is an integer number (147627900).

Almost surely, 2^6639740160 is an apocalyptic number.

6639740160 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6639740160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10629208800).

6639740160 is an abundant number, since it is smaller than the sum of its proper divisors (14618677440).

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

6639740160 is a wasteful number, since it uses less digits than its factorization.

6639740160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4324 (or 4310 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 42.

The square root of 6639740160 is about 81484.6007537621. The cubic root of 6639740160 is about 1879.5347573675.

The spelling of 6639740160 in words is "six billion, six hundred thirty-nine million, seven hundred forty thousand, one hundred sixty".