261616085 has 16 divisors (see below), whose sum is σ = 329932416. Its totient is φ = 198894528.

The previous prime is 261616057. The next prime is 261616097. The reversal of 261616085 is 580616162.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 261616085 - 2¹² = 261611989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8489 + ... + 24398.

It is an arithmetic number, because the mean of its divisors is an integer number (20620776).

Almost surely, 2^261616085 is an apocalyptic number.

It is an amenable number.

261616085 is a deficient number, since it is larger than the sum of its proper divisors (68316331).

261616085 is a wasteful number, since it uses less digits than its factorization.

261616085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32972.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 261616085 is about 16174.5505347135. The cubic root of 261616085 is about 639.5700929565.

The spelling of 261616085 in words is "two hundred sixty-one million, six hundred sixteen thousand, eighty-five".