6650566336440 has 320 divisors, whose sum is σ = 24723397812960. Its totient is φ = 1592817177600.

The previous prime is 6650566336429. The next prime is 6650566336457. The reversal of 6650566336440 is 446336650566.

It is a happy number.

6650566336440 is a `hidden beast` number, since 6 + 6 + 5 + 0 + 566 + 3 + 36 + 4 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 575286 + ... + 3692165.

Almost surely, 2^{6650566336440} is an apocalyptic number.

6650566336440 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 6650566336440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12361698906480).

6650566336440 is an abundant number, since it is smaller than the sum of its proper divisors (18072831476520).

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

6650566336440 is a wasteful number, since it uses less digits than its factorization.

6650566336440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4267524 (or 4267511 counting only the distinct ones).

The product of its (nonzero) digits is 27993600, while the sum is 54.

The spelling of 6650566336440 in words is "six trillion, six hundred fifty billion, five hundred sixty-six million, three hundred thirty-six thousand, four hundred forty".