6660061605 has 24 divisors (see below), whose sum is σ = 11856112632. Its totient is φ = 3456031104.

The previous prime is 6660061601. The next prime is 6660061637. The reversal of 6660061605 is 5061600666.

6660061605 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1212293124 + 5447768481 = 34818^2 + 73809^2 .

It is not a de Polignac number, because 6660061605 - 2² = 6660061601 is a prime.

6660061605 is a modest number, since divided by 61605 gives 6660 as remainder.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6660061605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6660061601) 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, 1998354 + ... + 2001683.

It is an arithmetic number, because the mean of its divisors is an integer number (494004693).

Almost surely, 2^6660061605 is an apocalyptic number.

It is an amenable number.

6660061605 is a deficient number, since it is larger than the sum of its proper divisors (5196051027).

6660061605 is a wasteful number, since it uses less digits than its factorization.

6660061605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4000085 (or 4000082 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 6660061605 is about 81609.2004923464. The cubic root of 6660061605 is about 1881.4502922767.

It can be divided in two parts, 6660061 and 605, that added together give a palindrome (6660666).

The spelling of 6660061605 in words is "six billion, six hundred sixty million, sixty-one thousand, six hundred five".