6663551500 has 48 divisors (see below), whose sum is σ = 14686832160. Its totient is φ = 2640945600.

The previous prime is 6663551491. The next prime is 6663551501. The reversal of 6663551500 is 51553666.

It is a happy number.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 6663551500.

It is not an unprimeable number, because it can be changed into a prime (6663551501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6634 + ... + 115633.

It is an arithmetic number, because the mean of its divisors is an integer number (305975670).

Almost surely, 2^6663551500 is an apocalyptic number.

It is an amenable number.

6663551500 is an abundant number, since it is smaller than the sum of its proper divisors (8023280660).

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

6663551500 is a wasteful number, since it uses less digits than its factorization.

6663551500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122395 (or 122383 counting only the distinct ones).

The product of its (nonzero) digits is 81000, while the sum is 37.

The square root of 6663551500 is about 81630.5794417754. The cubic root of 6663551500 is about 1881.7788636830.

The spelling of 6663551500 in words is "six billion, six hundred sixty-three million, five hundred fifty-one thousand, five hundred".