2620642665 has 16 divisors (see below), whose sum is σ = 4193827200. Its totient is φ = 1397409792.

The previous prime is 2620642649. The next prime is 2620642679. The reversal of 2620642665 is 5662460262.

It is not a de Polignac number, because 2620642665 - 2⁴ = 2620642649 is a prime.

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, 84556 + ... + 111314.

It is an arithmetic number, because the mean of its divisors is an integer number (262114200).

Almost surely, 2^2620642665 is an apocalyptic number.

It is an amenable number.

2620642665 is a deficient number, since it is larger than the sum of its proper divisors (1573184535).

2620642665 is a wasteful number, since it uses less digits than its factorization.

2620642665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33296.

The product of its (nonzero) digits is 207360, while the sum is 39.

The square root of 2620642665 is about 51192.2129332187. The cubic root of 2620642665 is about 1378.6983920196.

The spelling of 2620642665 in words is "two billion, six hundred twenty million, six hundred forty-two thousand, six hundred sixty-five".