2106660565 has 16 divisors (see below), whose sum is σ = 2628319680. Its totient is φ = 1619671680.

The previous prime is 2106660557. The next prime is 2106660571. The reversal of 2106660565 is 5650666012.

It is not a de Polignac number, because 2106660565 - 2³ = 2106660557 is a prime.

It is a super-2 number, since 2×2106660565² = 8876037472252238450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 62955 + ... + 90424.

It is an arithmetic number, because the mean of its divisors is an integer number (164269980).

Almost surely, 2^2106660565 is an apocalyptic number.

It is an amenable number.

2106660565 is a deficient number, since it is larger than the sum of its proper divisors (521659115).

2106660565 is a wasteful number, since it uses less digits than its factorization.

2106660565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153492.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 2106660565 is about 45898.3721388896. The cubic root of 2106660565 is about 1281.9316061118.

The spelling of 2106660565 in words is "two billion, one hundred six million, six hundred sixty thousand, five hundred sixty-five".