2620853813 has 4 divisors (see below), whose sum is σ = 2621275020. Its totient is φ = 2620432608.

The previous prime is 2620853803. The next prime is 2620853821. The reversal of 2620853813 is 3183580262.

2620853813 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 an emirpimes, since its reverse is a distinct semiprime: 3183580262 = 2 ⋅1591790131.

It can be written as a sum of positive squares in 2 ways, for example, as 1923524164 + 697329649 = 43858^2 + 26407^2 .

It is a cyclic number.

It is not a de Polignac number, because 2620853813 - 2²² = 2616659509 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 (2620853803) 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, 201128 + ... + 213761.

It is an arithmetic number, because the mean of its divisors is an integer number (655318755).

Almost surely, 2^2620853813 is an apocalyptic number.

It is an amenable number.

2620853813 is a deficient number, since it is larger than the sum of its proper divisors (421207).

2620853813 is an equidigital number, since it uses as much as digits as its factorization.

2620853813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421206.

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 2620853813 is about 51194.2751975257. The cubic root of 2620853813 is about 1378.7354187629.

The spelling of 2620853813 in words is "two billion, six hundred twenty million, eight hundred fifty-three thousand, eight hundred thirteen".