2640836717 has 4 divisors (see below), whose sum is σ = 2641205340. Its totient is φ = 2640468096.

The previous prime is 2640836699. The next prime is 2640836741. The reversal of 2640836717 is 7176380462.

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 1162741801 + 1478094916 = 34099^2 + 38446^2 .

It is a cyclic number.

It is not a de Polignac number, because 2640836717 - 2¹⁶ = 2640771181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640833717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173348 + ... + 187965.

It is an arithmetic number, because the mean of its divisors is an integer number (660301335).

Almost surely, 2^2640836717 is an apocalyptic number.

It is an amenable number.

2640836717 is a deficient number, since it is larger than the sum of its proper divisors (368623).

2640836717 is an equidigital number, since it uses as much as digits as its factorization.

2640836717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368622.

The product of its (nonzero) digits is 338688, while the sum is 44.

The square root of 2640836717 is about 51389.0719608751. The cubic root of 2640836717 is about 1382.2306424125.

The spelling of 2640836717 in words is "two billion, six hundred forty million, eight hundred thirty-six thousand, seven hundred seventeen".