261140710623321 has 16 divisors (see below), whose sum is σ = 353281713020928. Its totient is φ = 171563794774800.

The previous prime is 261140710623281. The next prime is 261140710623379. The reversal of 261140710623321 is 123326017041162.

It is a de Polignac number, because none of the positive numbers 2^k-261140710623321 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 261140710623321.

It is not an unprimeable number, because it can be changed into a prime (261140710623421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2129578645 + ... + 2129701266.

It is an arithmetic number, because the mean of its divisors is an integer number (22080107063808).

Almost surely, 2^{261140710623321} is an apocalyptic number.

It is an amenable number.

261140710623321 is a deficient number, since it is larger than the sum of its proper divisors (92141002397607).

261140710623321 is a wasteful number, since it uses less digits than its factorization.

261140710623321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4259280212.

The product of its (nonzero) digits is 72576, while the sum is 39.

Adding to 261140710623321 its reverse (123326017041162), we get a palindrome (384466727664483).

The spelling of 261140710623321 in words is "two hundred sixty-one trillion, one hundred forty billion, seven hundred ten million, six hundred twenty-three thousand, three hundred twenty-one".