2661172011 has 24 divisors (see below), whose sum is σ = 3896350640. Its totient is φ = 1750035456.

The previous prime is 2661171991. The next prime is 2661172039. The reversal of 2661172011 is 1102711662.

It is a happy number.

2661172011 is a `hidden beast` number, since 26 + 611 + 7 + 20 + 1 + 1 = 666.

It is not a de Polignac number, because 2661172011 - 2¹³ = 2661163819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2661172051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 268380 + ... + 278118.

Almost surely, 2^2661172011 is an apocalyptic number.

2661172011 is a deficient number, since it is larger than the sum of its proper divisors (1235178629).

2661172011 is a wasteful number, since it uses less digits than its factorization.

2661172011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10155 (or 10152 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 2661172011 is about 51586.5487409266. The cubic root of 2661172011 is about 1385.7694484177.

Adding to 2661172011 its reverse (1102711662), we get a palindrome (3763883673).

The spelling of 2661172011 in words is "two billion, six hundred sixty-one million, one hundred seventy-two thousand, eleven".