261435312256817 has 8 divisors (see below), whose sum is σ = 261646308913920. Its totient is φ = 261224398627920.

The previous prime is 261435312256801. The next prime is 261435312256843. The reversal of 261435312256817 is 718652213534162.

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

It is a cyclic number.

It is not a de Polignac number, because 261435312256817 - 2⁴ = 261435312256801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261435312256847) 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, 14456234 + ... + 27052787.

It is an arithmetic number, because the mean of its divisors is an integer number (32705788614240).

Almost surely, 2^{261435312256817} is an apocalyptic number.

It is an amenable number.

261435312256817 is a deficient number, since it is larger than the sum of its proper divisors (210996657103).

261435312256817 is a wasteful number, since it uses less digits than its factorization.

261435312256817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41514103.

The product of its digits is 14515200, while the sum is 56.

The spelling of 261435312256817 in words is "two hundred sixty-one trillion, four hundred thirty-five billion, three hundred twelve million, two hundred fifty-six thousand, eight hundred seventeen".