261166912 has 28 divisors (see below), whose sum is σ = 519833860. Its totient is φ = 130185216.

The previous prime is 261166901. The next prime is 261166931. The reversal of 261166912 is 219661162.

It can be written as a sum of positive squares in 2 ways, for example, as 192210496 + 68956416 = 13864^2 + 8304^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15514 + ... + 27622.

It is an arithmetic number, because the mean of its divisors is an integer number (18565495).

Almost surely, 2^261166912 is an apocalyptic number.

It is an amenable number.

261166912 is a deficient number, since it is larger than the sum of its proper divisors (258666948).

261166912 is a wasteful number, since it uses less digits than its factorization.

261166912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12458 (or 12448 counting only the distinct ones).

The product of its digits is 7776, while the sum is 34.

The square root of 261166912 is about 16160.6593924877. The cubic root of 261166912 is about 639.2038537719.

The spelling of 261166912 in words is "two hundred sixty-one million, one hundred sixty-six thousand, nine hundred twelve".