6645182544 has 640 divisors, whose sum is σ = 26025000960. Its totient is φ = 1580705280.

The previous prime is 6645182539. The next prime is 6645182611. The reversal of 6645182544 is 4452815466.

It is a happy number.

6645182544 is a `hidden beast` number, since 66 + 45 + 1 + 8 + 2 + 544 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 6645182544.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 52324209 + ... + 52324335.

It is an arithmetic number, because the mean of its divisors is an integer number (40664064).

Almost surely, 2^6645182544 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 6645182544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13012500480).

6645182544 is an abundant number, since it is smaller than the sum of its proper divisors (19379818416).

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

6645182544 is a wasteful number, since it uses less digits than its factorization.

6645182544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197 (or 163 counting only the distinct ones).

The product of its digits is 921600, while the sum is 45.

The square root of 6645182544 is about 81517.9890821652. The cubic root of 6645182544 is about 1880.0481487593.

The spelling of 6645182544 in words is "six billion, six hundred forty-five million, one hundred eighty-two thousand, five hundred forty-four".