261216568 has 16 divisors (see below), whose sum is σ = 490684680. Its totient is φ = 130367328.

The previous prime is 261216551. The next prime is 261216569. The reversal of 261216568 is 865612162.

261216568 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261216569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25471 + ... + 34222.

Almost surely, 2^261216568 is an apocalyptic number.

It is an amenable number.

261216568 is a deficient number, since it is larger than the sum of its proper divisors (229468112).

261216568 is a wasteful number, since it uses less digits than its factorization.

261216568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60246 (or 60242 counting only the distinct ones).

The product of its digits is 34560, while the sum is 37.

The square root of 261216568 is about 16162.1956429193. The cubic root of 261216568 is about 639.2443620876.

The spelling of 261216568 in words is "two hundred sixty-one million, two hundred sixteen thousand, five hundred sixty-eight".