2639948565 has 16 divisors (see below), whose sum is σ = 4224610368. Its totient is φ = 1407741696.

The previous prime is 2639948551. The next prime is 2639948599. The reversal of 2639948565 is 5658499362.

It is not a de Polignac number, because 2639948565 - 2⁹ = 2639948053 is a prime.

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, 121242 + ... + 141348.

It is an arithmetic number, because the mean of its divisors is an integer number (264038148).

Almost surely, 2^2639948565 is an apocalyptic number.

It is an amenable number.

2639948565 is a deficient number, since it is larger than the sum of its proper divisors (1584661803).

2639948565 is a wasteful number, since it uses less digits than its factorization.

2639948565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28868.

The product of its digits is 13996800, while the sum is 57.

The square root of 2639948565 is about 51380.4297860576. The cubic root of 2639948565 is about 1382.0756702465.

The spelling of 2639948565 in words is "two billion, six hundred thirty-nine million, nine hundred forty-eight thousand, five hundred sixty-five".