6660615066 has 64 divisors (see below), whose sum is σ = 15708349440. Its totient is φ = 1843194240.

The previous prime is 6660615043. The next prime is 6660615083. The reversal of 6660615066 is 6605160666.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon 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, 225445 + ... + 253271.

It is an arithmetic number, because the mean of its divisors is an integer number (245442960).

Almost surely, 2^6660615066 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6660615066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7854174720).

6660615066 is an abundant number, since it is smaller than the sum of its proper divisors (9047734374).

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

6660615066 is a wasteful number, since it uses less digits than its factorization.

6660615066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28019.

The product of its (nonzero) digits is 233280, while the sum is 42.

The square root of 6660615066 is about 81612.5913447184. The cubic root of 6660615066 is about 1881.5024079366.

The spelling of 6660615066 in words is "six billion, six hundred sixty million, six hundred fifteen thousand, sixty-six".