234540616561 has 2 divisors, whose sum is σ = 234540616562. Its totient is φ = 234540616560.

The previous prime is 234540616547. The next prime is 234540616579. The reversal of 234540616561 is 165616045432.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123021353536 + 111519263025 = 350744^2 + 333945^2 .

It is a cyclic number.

It is not a de Polignac number, because 234540616561 - 2¹⁷ = 234540485489 is a prime.

It is not a weakly prime, because it can be changed into another prime (234540616591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 117270308280 + 117270308281.

It is an arithmetic number, because the mean of its divisors is an integer number (117270308281).

Almost surely, 2^234540616561 is an apocalyptic number.

It is an amenable number.

234540616561 is a deficient number, since it is larger than the sum of its proper divisors (1).

234540616561 is an equidigital number, since it uses as much as digits as its factorization.

234540616561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 518400, while the sum is 43.

The spelling of 234540616561 in words is "two hundred thirty-four billion, five hundred forty million, six hundred sixteen thousand, five hundred sixty-one".