6660065550 has 48 divisors (see below), whose sum is σ = 16527513600. Its totient is φ = 1774883040.

The previous prime is 6660065519. The next prime is 6660065551. The reversal of 6660065550 is 555600666.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6660065499 and 6660065508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6660065551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 236101 + ... + 262799.

It is an arithmetic number, because the mean of its divisors is an integer number (344323200).

Almost surely, 2^6660065550 is an apocalyptic number.

6660065550 is an abundant number, since it is smaller than the sum of its proper divisors (9867448050).

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

6660065550 is a wasteful number, since it uses less digits than its factorization.

6660065550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28377 (or 28372 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 39.

The square root of 6660065550 is about 81609.2246624118. The cubic root of 6660065550 is about 1881.4506637608.

The spelling of 6660065550 in words is "six billion, six hundred sixty million, sixty-five thousand, five hundred fifty".