6645370004 has 108 divisors (see below), whose sum is σ = 15421190400. Its totient is φ = 2490336576.

The previous prime is 6645369979. The next prime is 6645370019. The reversal of 6645370004 is 4000735466.

It is a super-3 number, since 3×6645370004³ (a number of 30 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 624077 + ... + 634635.

It is an arithmetic number, because the mean of its divisors is an integer number (142788800).

Almost surely, 2^6645370004 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 6645370004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7710595200).

6645370004 is an abundant number, since it is smaller than the sum of its proper divisors (8775820396).

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

6645370004 is a wasteful number, since it uses less digits than its factorization.

6645370004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10622 (or 10600 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 35.

The square root of 6645370004 is about 81519.1388816148. The cubic root of 6645370004 is about 1880.0658272560.

The spelling of 6645370004 in words is "six billion, six hundred forty-five million, three hundred seventy thousand, four".