261552403011413 has 2 divisors, whose sum is σ = 261552403011414. Its totient is φ = 261552403011412.

The previous prime is 261552403011407. The next prime is 261552403011461. The reversal of 261552403011413 is 314110304255162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 217903151740849 + 43649251270564 = 14761543^2 + 6606758^2 .

It is a cyclic number.

It is not a de Polignac number, because 261552403011413 - 2⁸ = 261552403011157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261552403011013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130776201505706 + 130776201505707.

It is an arithmetic number, because the mean of its divisors is an integer number (130776201505707).

Almost surely, 2^{261552403011413} is an apocalyptic number.

It is an amenable number.

261552403011413 is a deficient number, since it is larger than the sum of its proper divisors (1).

261552403011413 is an equidigital number, since it uses as much as digits as its factorization.

261552403011413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 86400, while the sum is 38.

Adding to 261552403011413 its reverse (314110304255162), we get a palindrome (575662707266575).

The spelling of 261552403011413 in words is "two hundred sixty-one trillion, five hundred fifty-two billion, four hundred three million, eleven thousand, four hundred thirteen".