6660263988 has 96 divisors (see below), whose sum is σ = 19748126720. Its totient is φ = 1901581920.

The previous prime is 6660263977. The next prime is 6660264001. The reversal of 6660263988 is 8893620666.

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 31 ways as a sum of consecutive naturals, for example, 1618053 + ... + 1622163.

Almost surely, 2^6660263988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6660263988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9874063360).

6660263988 is an abundant number, since it is smaller than the sum of its proper divisors (13087862732).

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

6660263988 is a wasteful number, since it uses less digits than its factorization.

6660263988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6274 (or 6266 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 54.

The square root of 6660263988 is about 81610.4404350326. The cubic root of 6660263988 is about 1881.4693496429.

The spelling of 6660263988 in words is "six billion, six hundred sixty million, two hundred sixty-three thousand, nine hundred eighty-eight".