6640411544 has 96 divisors (see below), whose sum is σ = 14217431040. Its totient is φ = 2901974400.

The previous prime is 6640411541. The next prime is 6640411567. The reversal of 6640411544 is 4451140466.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640411541) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1968179 + ... + 1971549.

It is an arithmetic number, because the mean of its divisors is an integer number (148098240).

Almost surely, 2^6640411544 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 6640411544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7108715520).

6640411544 is an abundant number, since it is smaller than the sum of its proper divisors (7577019496).

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

6640411544 is a wasteful number, since it uses less digits than its factorization.

6640411544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3481 (or 3464 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 35.

The square root of 6640411544 is about 81488.7203482789. The cubic root of 6640411544 is about 1879.5981055811.

The spelling of 6640411544 in words is "six billion, six hundred forty million, four hundred eleven thousand, five hundred forty-four".