261310856611 has 8 divisors (see below), whose sum is σ = 299660233824. Its totient is φ = 223216293120.

The previous prime is 261310856557. The next prime is 261310856623. The reversal of 261310856611 is 116658013162.

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 261310856611 - 2²⁹ = 260773985699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261310856111) 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, 63701230 + ... + 63705331.

It is an arithmetic number, because the mean of its divisors is an integer number (37457529228).

Almost surely, 2^261310856611 is an apocalyptic number.

261310856611 is a deficient number, since it is larger than the sum of its proper divisors (38349377213).

261310856611 is a wasteful number, since it uses less digits than its factorization.

261310856611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127406861.

The product of its (nonzero) digits is 51840, while the sum is 40.

Adding to 261310856611 its reverse (116658013162), we get a palindrome (377968869773).

The spelling of 261310856611 in words is "two hundred sixty-one billion, three hundred ten million, eight hundred fifty-six thousand, six hundred eleven".