2661521311 has 8 divisors (see below), whose sum is σ = 2861210880. Its totient is φ = 2467792728.

The previous prime is 2661521287. The next prime is 2661521341. The reversal of 2661521311 is 1131251662.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2661521311 - 2⁷ = 2661521183 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2661521311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661521341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1489321 + ... + 1491106.

It is an arithmetic number, because the mean of its divisors is an integer number (357651360).

Almost surely, 2^2661521311 is an apocalyptic number.

2661521311 is a deficient number, since it is larger than the sum of its proper divisors (199689569).

2661521311 is a wasteful number, since it uses less digits than its factorization.

2661521311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2980493.

The product of its digits is 2160, while the sum is 28.

The square root of 2661521311 is about 51589.9342023228. The cubic root of 2661521311 is about 1385.8300768538.

Adding to 2661521311 its reverse (1131251662), we get a palindrome (3792772973).

The spelling of 2661521311 in words is "two billion, six hundred sixty-one million, five hundred twenty-one thousand, three hundred eleven".