261656341057733 has 4 divisors (see below), whose sum is σ = 261704858834508. Its totient is φ = 261607823280960.

The previous prime is 261656341057729. The next prime is 261656341057789. The reversal of 261656341057733 is 337750143656162.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 255866961288964 + 5789379768769 = 15995842^2 + 2406113^2 .

It is a cyclic number.

It is not a de Polignac number, because 261656341057733 - 2² = 261656341057729 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261656341057333) 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, 24258880298 + ... + 24258891083.

It is an arithmetic number, because the mean of its divisors is an integer number (65426214708627).

Almost surely, 2^{261656341057733} is an apocalyptic number.

It is an amenable number.

261656341057733 is a deficient number, since it is larger than the sum of its proper divisors (48517776775).

261656341057733 is an equidigital number, since it uses as much as digits as its factorization.

261656341057733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48517776774.

The product of its (nonzero) digits is 57153600, while the sum is 59.

The spelling of 261656341057733 in words is "two hundred sixty-one trillion, six hundred fifty-six billion, three hundred forty-one million, fifty-seven thousand, seven hundred thirty-three".