2661611266 has 16 divisors (see below), whose sum is σ = 4053456504. Its totient is φ = 1310609664.

The previous prime is 2661611261. The next prime is 2661611297. The reversal of 2661611266 is 6621161662.

2661611266 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 2020053025 + 641558241 = 44945^2 + 25329^2 .

It is not an unprimeable number, because it can be changed into a prime (2661611261) 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, 2025 + ... + 72988.

Almost surely, 2^2661611266 is an apocalyptic number.

2661611266 is a deficient number, since it is larger than the sum of its proper divisors (1391845238).

2661611266 is a wasteful number, since it uses less digits than its factorization.

2661611266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75285.

The product of its digits is 31104, while the sum is 37.

The square root of 2661611266 is about 51590.8060220036. The cubic root of 2661611266 is about 1385.8456895962.

The spelling of 2661611266 in words is "two billion, six hundred sixty-one million, six hundred eleven thousand, two hundred sixty-six".