6615055566 has 96 divisors (see below), whose sum is σ = 17126484480. Its totient is φ = 1887106032.

The previous prime is 6615055501. The next prime is 6615055571. The reversal of 6615055566 is 6655505166.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2186731 + ... + 2189753.

It is an arithmetic number, because the mean of its divisors is an integer number (178400880).

Almost surely, 2^6615055566 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6615055566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8563242240).

6615055566 is an abundant number, since it is smaller than the sum of its proper divisors (10511428914).

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

6615055566 is a wasteful number, since it uses less digits than its factorization.

6615055566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3875 (or 3862 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 45.

The square root of 6615055566 is about 81332.9918667695. The cubic root of 6615055566 is about 1877.2026798409.

Subtracting 6615055566 from its reverse (6655505166), we obtain a square (40449600 = 6360²).

The spelling of 6615055566 in words is "six billion, six hundred fifteen million, fifty-five thousand, five hundred sixty-six".