6663855744 has 480 divisors, whose sum is σ = 24868512900. Its totient is φ = 1755758592.

The previous prime is 6663855743. The next prime is 6663855767. The reversal of 6663855744 is 4475583666.

It can be written as a sum of positive squares in 2 ways, for example, as 6102734400 + 561121344 = 78120^2 + 23688^2 .

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

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

It is not an unprimeable number, because it can be changed into a prime (6663855743) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 6603912 + ... + 6604920.

Almost surely, 2^6663855744 is an apocalyptic number.

6663855744 is a gapful number since it is divisible by the number (64) 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 6663855744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12434256450).

6663855744 is an abundant number, since it is smaller than the sum of its proper divisors (18204657156).

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

6663855744 is a wasteful number, since it uses less digits than its factorization.

6663855744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1062 (or 1034 counting only the distinct ones).

The product of its digits is 14515200, while the sum is 54.

The square root of 6663855744 is about 81632.4429623419. The cubic root of 6663855744 is about 1881.8075026260.

The spelling of 6663855744 in words is "six billion, six hundred sixty-three million, eight hundred fifty-five thousand, seven hundred forty-four".