3205116561 has 4 divisors (see below), whose sum is σ = 4273488752. Its totient is φ = 2136744372.

The previous prime is 3205116547. The next prime is 3205116571. The reversal of 3205116561 is 1656115023.

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 not a de Polignac number, because 3205116561 - 2¹⁹ = 3204592273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3205116521) 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, 534186091 + ... + 534186096.

It is an arithmetic number, because the mean of its divisors is an integer number (1068372188).

Almost surely, 2^3205116561 is an apocalyptic number.

It is an amenable number.

3205116561 is a deficient number, since it is larger than the sum of its proper divisors (1068372191).

3205116561 is a wasteful number, since it uses less digits than its factorization.

3205116561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1068372190.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 3205116561 is about 56613.7488689806. The cubic root of 3205116561 is about 1474.3975800583.

The spelling of 3205116561 in words is "three billion, two hundred five million, one hundred sixteen thousand, five hundred sixty-one".