2660611665 has 16 divisors (see below), whose sum is σ = 4257825408. Its totient is φ = 1418710656.

The previous prime is 2660611663. The next prime is 2660611693. The reversal of 2660611665 is 5661160662.

It is not a de Polignac number, because 2660611665 - 2¹ = 2660611663 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2660611661) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 76492 + ... + 105698.

It is an arithmetic number, because the mean of its divisors is an integer number (266114088).

Almost surely, 2^2660611665 is an apocalyptic number.

It is an amenable number.

2660611665 is a deficient number, since it is larger than the sum of its proper divisors (1597213743).

2660611665 is a wasteful number, since it uses less digits than its factorization.

2660611665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35288.

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 2660611665 is about 51581.1173298912. The cubic root of 2660611665 is about 1385.6721773817.

The spelling of 2660611665 in words is "two billion, six hundred sixty million, six hundred eleven thousand, six hundred sixty-five".