4005661266 has 12 divisors (see below), whose sum is σ = 8678932782. Its totient is φ = 1335220416.

The previous prime is 4005661237. The next prime is 4005661333. The reversal of 4005661266 is 6621665004.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2618471241 + 1387190025 = 51171^2 + 37245^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 4005661266.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 111268351 + ... + 111268386.

Almost surely, 2^4005661266 is an apocalyptic number.

4005661266 is an abundant number, since it is smaller than the sum of its proper divisors (4673271516).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4005661266 is a wasteful number, since it uses less digits than its factorization.

4005661266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222536745 (or 222536742 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 4005661266 is about 63290.2936160040. The cubic root of 4005661266 is about 1588.1495905732.

The spelling of 4005661266 in words is "four billion, five million, six hundred sixty-one thousand, two hundred sixty-six".