2638846817 has 4 divisors (see below), whose sum is σ = 2640325296. Its totient is φ = 2637368340.

The previous prime is 2638846807. The next prime is 2638846823. The reversal of 2638846817 is 7186488362.

2638846817 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7186488362 = 2 ⋅3593244181.

It is a cyclic number.

It is not a de Polignac number, because 2638846817 - 2¹⁰ = 2638845793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2638846807) 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, 736559 + ... + 740132.

It is an arithmetic number, because the mean of its divisors is an integer number (660081324).

Almost surely, 2^2638846817 is an apocalyptic number.

It is an amenable number.

2638846817 is a deficient number, since it is larger than the sum of its proper divisors (1478479).

2638846817 is a wasteful number, since it uses less digits than its factorization.

2638846817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1478478.

The product of its digits is 3096576, while the sum is 53.

The square root of 2638846817 is about 51369.7071920797. The cubic root of 2638846817 is about 1381.8833797601.

The spelling of 2638846817 in words is "two billion, six hundred thirty-eight million, eight hundred forty-six thousand, eight hundred seventeen".