6663536640 has 192 divisors, whose sum is σ = 23105019600. Its totient is φ = 1776549888.

The previous prime is 6663536629. The next prime is 6663536717. The reversal of 6663536640 is 466353666.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (192).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1472301 + ... + 1476819.

Almost surely, 2^6663536640 is an apocalyptic number.

6663536640 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 6663536640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11552509800).

6663536640 is an abundant number, since it is smaller than the sum of its proper divisors (16441482960).

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

6663536640 is an equidigital number, since it uses as much as digits as its factorization.

6663536640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4560 (or 4529 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 45.

The square root of 6663536640 is about 81630.4884219126. The cubic root of 6663536640 is about 1881.7774648666. Note that the first 3 decimals are identical.

The spelling of 6663536640 in words is "six billion, six hundred sixty-three million, five hundred thirty-six thousand, six hundred forty".