6664655340 has 288 divisors, whose sum is σ = 24140712960. Its totient is φ = 1456455168.

The previous prime is 6664655323. The next prime is 6664655341. The reversal of 6664655340 is 435564666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (6664655341) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2749369 + ... + 2751791.

It is an arithmetic number, because the mean of its divisors is an integer number (83821920).

Almost surely, 2^6664655340 is an apocalyptic number.

6664655340 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 6664655340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12070356480).

6664655340 is an abundant number, since it is smaller than the sum of its proper divisors (17476057620).

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

6664655340 is a wasteful number, since it uses less digits than its factorization.

6664655340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2541 (or 2536 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 45.

The square root of 6664655340 is about 81637.3403535417. The cubic root of 6664655340 is about 1881.8827656384.

The spelling of 6664655340 in words is "six billion, six hundred sixty-four million, six hundred fifty-five thousand, three hundred forty".