261133422617 has 2 divisors, whose sum is σ = 261133422618. Its totient is φ = 261133422616.

The previous prime is 261133422611. The next prime is 261133422623. The reversal of 261133422617 is 716224331162.

It is a balanced prime because it is at equal distance from previous prime (261133422611) and next prime (261133422623).

It can be written as a sum of positive squares in only one way, i.e., 260938094041 + 195328576 = 510821^2 + 13976^2 .

It is a cyclic number.

It is not a de Polignac number, because 261133422617 - 2¹² = 261133418521 is a prime.

It is a super-3 number, since 3×261133422617³ (a number of 35 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (261133422611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130566711308 + 130566711309.

It is an arithmetic number, because the mean of its divisors is an integer number (130566711309).

Almost surely, 2^261133422617 is an apocalyptic number.

It is an amenable number.

261133422617 is a deficient number, since it is larger than the sum of its proper divisors (1).

261133422617 is an equidigital number, since it uses as much as digits as its factorization.

261133422617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 38.

Adding to 261133422617 its reverse (716224331162), we get a palindrome (977357753779).

The spelling of 261133422617 in words is "two hundred sixty-one billion, one hundred thirty-three million, four hundred twenty-two thousand, six hundred seventeen".