3305721261 has 16 divisors (see below), whose sum is σ = 4468169664. Its totient is φ = 2173632384.

The previous prime is 3305721259. The next prime is 3305721311. The reversal of 3305721261 is 1621275033.

It is not a de Polignac number, because 3305721261 - 2¹ = 3305721259 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3305729261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142875 + ... + 164391.

It is an arithmetic number, because the mean of its divisors is an integer number (279260604).

Almost surely, 2^3305721261 is an apocalyptic number.

It is an amenable number.

3305721261 is a deficient number, since it is larger than the sum of its proper divisors (1162448403).

3305721261 is a wasteful number, since it uses less digits than its factorization.

3305721261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22220.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 3305721261 is about 57495.4020857320. The cubic root of 3305721261 is about 1489.6654446080.

Adding to 3305721261 its reverse (1621275033), we get a palindrome (4926996294).

The spelling of 3305721261 in words is "three billion, three hundred five million, seven hundred twenty-one thousand, two hundred sixty-one".