261055263321 has 6 divisors (see below), whose sum is σ = 377079824810. Its totient is φ = 174036842208.

The previous prime is 261055263317. The next prime is 261055263323. The reversal of 261055263321 is 123362550162.

261055263321 is a `hidden beast` number, since 2 + 6 + 10 + 5 + 5 + 2 + 633 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 260675598096 + 379665225 = 510564^2 + 19485^2 .

It is not a de Polignac number, because 261055263321 - 2² = 261055263317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261055263323) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14503070176 + ... + 14503070193.

Almost surely, 2^261055263321 is an apocalyptic number.

It is an amenable number.

261055263321 is a deficient number, since it is larger than the sum of its proper divisors (116024561489).

261055263321 is a wasteful number, since it uses less digits than its factorization.

261055263321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29006140375 (or 29006140372 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The spelling of 261055263321 in words is "two hundred sixty-one billion, fifty-five million, two hundred sixty-three thousand, three hundred twenty-one".