261240610117 has 8 divisors (see below), whose sum is σ = 262099000800. Its totient is φ = 260383338864.

The previous prime is 261240610093. The next prime is 261240610151. The reversal of 261240610117 is 711016042162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261240610117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261240610157) 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, 188934 + ... + 747112.

It is an arithmetic number, because the mean of its divisors is an integer number (32762375100).

Almost surely, 2^261240610117 is an apocalyptic number.

It is an amenable number.

261240610117 is a deficient number, since it is larger than the sum of its proper divisors (858390683).

261240610117 is a wasteful number, since it uses less digits than its factorization.

261240610117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559715.

The product of its (nonzero) digits is 4032, while the sum is 31.

Adding to 261240610117 its reverse (711016042162), we get a palindrome (972256652279).

The spelling of 261240610117 in words is "two hundred sixty-one billion, two hundred forty million, six hundred ten thousand, one hundred seventeen".