6664521006 has 144 divisors (see below), whose sum is σ = 17252293968. Its totient is φ = 1846817280.

The previous prime is 6664520981. The next prime is 6664521011. The reversal of 6664521006 is 6001254666.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3198441 + ... + 3200523.

It is an arithmetic number, because the mean of its divisors is an integer number (119807597).

Almost surely, 2^6664521006 is an apocalyptic number.

6664521006 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 6664521006, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8626146984).

6664521006 is an abundant number, since it is smaller than the sum of its proper divisors (10587772962).

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

6664521006 is a wasteful number, since it uses less digits than its factorization.

6664521006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2239 (or 2225 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 6664521006 is about 81636.5176008874. The cubic root of 6664521006 is about 1881.8701216969.

The spelling of 6664521006 in words is "six billion, six hundred sixty-four million, five hundred twenty-one thousand, six".