2818856813 has 4 divisors (see below), whose sum is σ = 2820152640. Its totient is φ = 2817560988.

The previous prime is 2818856783. The next prime is 2818856827. The reversal of 2818856813 is 3186588182.

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.

It is a cyclic number.

It is not a de Polignac number, because 2818856813 - 2¹² = 2818852717 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 (2818856863) 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, 644645 + ... + 649002.

It is an arithmetic number, because the mean of its divisors is an integer number (705038160).

Almost surely, 2^2818856813 is an apocalyptic number.

It is an amenable number.

2818856813 is a deficient number, since it is larger than the sum of its proper divisors (1295827).

2818856813 is a wasteful number, since it uses less digits than its factorization.

2818856813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1295826.

The product of its digits is 737280, while the sum is 50.

The square root of 2818856813 is about 53092.9073700056. The cubic root of 2818856813 is about 1412.6167080115.

The spelling of 2818856813 in words is "two billion, eight hundred eighteen million, eight hundred fifty-six thousand, eight hundred thirteen".