2055216685 has 4 divisors (see below), whose sum is σ = 2466260028. Its totient is φ = 1644173344.

The previous prime is 2055216673. The next prime is 2055216721. The reversal of 2055216685 is 5866125502.

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 585107721 + 1470108964 = 24189^2 + 38342^2 .

It is a cyclic number.

It is not a de Polignac number, because 2055216685 - 2⁷ = 2055216557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205521664 + ... + 205521673.

It is an arithmetic number, because the mean of its divisors is an integer number (616565007).

Almost surely, 2^2055216685 is an apocalyptic number.

It is an amenable number.

2055216685 is a deficient number, since it is larger than the sum of its proper divisors (411043343).

2055216685 is an equidigital number, since it uses as much as digits as its factorization.

2055216685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411043342.

The product of its (nonzero) digits is 144000, while the sum is 40.

The square root of 2055216685 is about 45334.4977362714. The cubic root of 2055216685 is about 1271.4107300897.

The spelling of 2055216685 in words is "two billion, fifty-five million, two hundred sixteen thousand, six hundred eighty-five".