6655440000 has 320 divisors, whose sum is σ = 24108907680. Its totient is φ = 1612800000.

The previous prime is 6655439983. The next prime is 6655440019. The reversal of 6655440000 is 445566.

It is a tau number, because it is divible by the number of its divisors (320).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 6655440000.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2638740 + ... + 2641260.

Almost surely, 2^6655440000 is an apocalyptic number.

6655440000 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 6655440000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12054453840).

6655440000 is an abundant number, since it is smaller than the sum of its proper divisors (17453467680).

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

6655440000 is a wasteful number, since it uses less digits than its factorization.

6655440000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2569 (or 2542 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 6655440000 is about 81580.8801129284. The cubic root of 6655440000 is about 1881.0149943932.

Adding to 6655440000 its reverse (445566), we get a palindrome (6655885566).

The spelling of 6655440000 in words is "six billion, six hundred fifty-five million, four hundred forty thousand".