6645550740480 has 528 divisors, whose sum is σ = 24413229017424. Its totient is φ = 1665710161920.

The previous prime is 6645550740473. The next prime is 6645550740487. The reversal of 6645550740480 is 840470555466.

6645550740480 is a `hidden beast` number, since 6 + 6 + 4 + 5 + 550 + 7 + 4 + 0 + 4 + 80 = 666.

It is an interprime number because it is at equal distance from previous prime (6645550740473) and next prime (6645550740487).

It can be written as a sum of positive squares in 8 ways, for example, as 45502009344 + 6600048731136 = 213312^2 + 2569056^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6645550740487) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 643133394 + ... + 643143726.

Almost surely, 2^{6645550740480} is an apocalyptic number.

6645550740480 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 6645550740480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12206614508712).

6645550740480 is an abundant number, since it is smaller than the sum of its proper divisors (17767678276944).

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

6645550740480 is a wasteful number, since it uses less digits than its factorization.

6645550740480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11202 (or 11181 counting only the distinct ones).

The product of its (nonzero) digits is 16128000, while the sum is 54.

The spelling of 6645550740480 in words is "six trillion, six hundred forty-five billion, five hundred fifty million, seven hundred forty thousand, four hundred eighty".