260711782781 has 4 divisors (see below), whose sum is σ = 260712832512. Its totient is φ = 260710733052.

The previous prime is 260711782703. The next prime is 260711782783. The reversal of 260711782781 is 187287117062.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 187287117062 = 2 ⋅93643558531.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-260711782781 is a prime.

It is a super-2 number, since 2×260711782781² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (260711782783) 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, 80126 + ... + 726528.

It is an arithmetic number, because the mean of its divisors is an integer number (65178208128).

Almost surely, 2^260711782781 is an apocalyptic number.

It is an amenable number.

260711782781 is a deficient number, since it is larger than the sum of its proper divisors (1049731).

260711782781 is an equidigital number, since it uses as much as digits as its factorization.

260711782781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1049730.

The product of its (nonzero) digits is 526848, while the sum is 50.

The spelling of 260711782781 in words is "two hundred sixty billion, seven hundred eleven million, seven hundred eighty-two thousand, seven hundred eighty-one".