6615606065 has 4 divisors (see below), whose sum is σ = 7938727284. Its totient is φ = 5292484848.

The previous prime is 6615606061. The next prime is 6615606073. The reversal of 6615606065 is 5606065166.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3960059041 + 2655547024 = 62929^2 + 51532^2 .

It is a cyclic number.

It is not a de Polignac number, because 6615606065 - 2² = 6615606061 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6615606061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 661560602 + ... + 661560611.

It is an arithmetic number, because the mean of its divisors is an integer number (1984681821).

Almost surely, 2^6615606065 is an apocalyptic number.

It is an amenable number.

6615606065 is a deficient number, since it is larger than the sum of its proper divisors (1323121219).

6615606065 is a wasteful number, since it uses less digits than its factorization.

6615606065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1323121218.

The product of its (nonzero) digits is 194400, while the sum is 41.

The square root of 6615606065 is about 81336.3760257365. The cubic root of 6615606065 is about 1877.2547514384.

The spelling of 6615606065 in words is "six billion, six hundred fifteen million, six hundred six thousand, sixty-five".