261602544382349 has 2 divisors, whose sum is σ = 261602544382350. Its totient is φ = 261602544382348.

The previous prime is 261602544382279. The next prime is 261602544382363. The reversal of 261602544382349 is 943283445206162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164171687702500 + 97430856679849 = 12812950^2 + 9870707^2 .

It is a cyclic number.

It is not a de Polignac number, because 261602544382349 - 2³² = 261598249415053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261602544352349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130801272191174 + 130801272191175.

It is an arithmetic number, because the mean of its divisors is an integer number (130801272191175).

Almost surely, 2^{261602544382349} is an apocalyptic number.

It is an amenable number.

261602544382349 is a deficient number, since it is larger than the sum of its proper divisors (1).

261602544382349 is an equidigital number, since it uses as much as digits as its factorization.

261602544382349 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 59719680, while the sum is 59.

The spelling of 261602544382349 in words is "two hundred sixty-one trillion, six hundred two billion, five hundred forty-four million, three hundred eighty-two thousand, three hundred forty-nine".