261450632656513 has 2 divisors, whose sum is σ = 261450632656514. Its totient is φ = 261450632656512.

The previous prime is 261450632656501. The next prime is 261450632656547. The reversal of 261450632656513 is 315656236054162.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 216660500849664 + 44790131806849 = 14719392^2 + 6692543^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261450632656513 is a prime.

It is not a weakly prime, because it can be changed into another prime (261450632651513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130725316328256 + 130725316328257.

It is an arithmetic number, because the mean of its divisors is an integer number (130725316328257).

Almost surely, 2^{261450632656513} is an apocalyptic number.

It is an amenable number.

261450632656513 is a deficient number, since it is larger than the sum of its proper divisors (1).

261450632656513 is an equidigital number, since it uses as much as digits as its factorization.

261450632656513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328000, while the sum is 55.

The spelling of 261450632656513 in words is "two hundred sixty-one trillion, four hundred fifty billion, six hundred thirty-two million, six hundred fifty-six thousand, five hundred thirteen".