261040452416 has 14 divisors (see below), whose sum is σ = 518002147890. Its totient is φ = 130520226176.

The previous prime is 261040452397. The next prime is 261040452451. The reversal of 261040452416 is 614254040162.

It can be written as a sum of positive squares in only one way, i.e., 158486794816 + 102553657600 = 398104^2 + 320240^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2039378471 + ... + 2039378598.

Almost surely, 2^261040452416 is an apocalyptic number.

It is an amenable number.

261040452416 is a deficient number, since it is larger than the sum of its proper divisors (256961695474).

261040452416 is an equidigital number, since it uses as much as digits as its factorization.

261040452416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4078757081 (or 4078757071 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 35.

Adding to 261040452416 its reverse (614254040162), we get a palindrome (875294492578).

The spelling of 261040452416 in words is "two hundred sixty-one billion, forty million, four hundred fifty-two thousand, four hundred sixteen".