2661261105 has 16 divisors (see below), whose sum is σ = 4321571904. Its totient is φ = 1398154560.

The previous prime is 2661261089. The next prime is 2661261133. The reversal of 2661261105 is 5011621662.

It is not a de Polignac number, because 2661261105 - 2⁴ = 2661261089 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1323006 + ... + 1325015.

It is an arithmetic number, because the mean of its divisors is an integer number (270098244).

Almost surely, 2^2661261105 is an apocalyptic number.

It is an amenable number.

2661261105 is a deficient number, since it is larger than the sum of its proper divisors (1660310799).

2661261105 is a wasteful number, since it uses less digits than its factorization.

2661261105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2648096.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 2661261105 is about 51587.4122727628. The cubic root of 2661261105 is about 1385.7849130782.

Adding to 2661261105 its reverse (5011621662), we get a palindrome (7672882767).

The spelling of 2661261105 in words is "two billion, six hundred sixty-one million, two hundred sixty-one thousand, one hundred five".