2805216261 has 16 divisors (see below), whose sum is σ = 3777523200. Its totient is φ = 1851553728.

The previous prime is 2805216217. The next prime is 2805216263. The reversal of 2805216261 is 1626125082.

It is not a de Polignac number, because 2805216261 - 2¹⁴ = 2805199877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2805216263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 572755 + ... + 577631.

It is an arithmetic number, because the mean of its divisors is an integer number (236095200).

Almost surely, 2^2805216261 is an apocalyptic number.

It is an amenable number.

2805216261 is a deficient number, since it is larger than the sum of its proper divisors (972306939).

2805216261 is a wasteful number, since it uses less digits than its factorization.

2805216261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6748.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 2805216261 is about 52964.2923203926. The cubic root of 2805216261 is about 1410.3344546376.

The spelling of 2805216261 in words is "two billion, eight hundred five million, two hundred sixteen thousand, two hundred sixty-one".