1261041066 has 24 divisors (see below), whose sum is σ = 2734719780. Its totient is φ = 419967936.

The previous prime is 1261041053. The next prime is 1261041073. The reversal of 1261041066 is 6601401621.

1261041066 is a `hidden beast` number, since 1 + 2 + 610 + 41 + 0 + 6 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1134005625 + 127035441 = 33675^2 + 11271^2 .

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 10705 + ... + 51348.

Almost surely, 2^1261041066 is an apocalyptic number.

1261041066 is an abundant number, since it is smaller than the sum of its proper divisors (1473678714).

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

1261041066 is a wasteful number, since it uses less digits than its factorization.

1261041066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63190 (or 63187 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 1261041066 is about 35511.1400267578. The cubic root of 1261041066 is about 1080.3796864600.

Adding to 1261041066 its reverse (6601401621), we get a palindrome (7862442687).

The spelling of 1261041066 in words is "one billion, two hundred sixty-one million, forty-one thousand, sixty-six".