261136066 has 16 divisors (see below), whose sum is σ = 409120704. Its totient is φ = 124773264.

The previous prime is 261136049. The next prime is 261136069. The reversal of 261136066 is 660631162.

261136066 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (261136069) 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, 64885 + ... + 68791.

It is an arithmetic number, because the mean of its divisors is an integer number (25570044).

Almost surely, 2^261136066 is an apocalyptic number.

261136066 is a deficient number, since it is larger than the sum of its proper divisors (147984638).

261136066 is a wasteful number, since it uses less digits than its factorization.

261136066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5385.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 261136066 is about 16159.7050096838. The cubic root of 261136066 is about 639.1786876713.

The spelling of 261136066 in words is "two hundred sixty-one million, one hundred thirty-six thousand, sixty-six".