261514645353719 has 2 divisors, whose sum is σ = 261514645353720. Its totient is φ = 261514645353718.

The previous prime is 261514645353697. The next prime is 261514645353779. The reversal of 261514645353719 is 917353546415162.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261514645353719 is a prime.

It is a super-2 number, since 2×261514645353719² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261514645353779) 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, 130757322676859 + 130757322676860.

It is an arithmetic number, because the mean of its divisors is an integer number (130757322676860).

Almost surely, 2^{261514645353719} is an apocalyptic number.

261514645353719 is a deficient number, since it is larger than the sum of its proper divisors (1).

261514645353719 is an equidigital number, since it uses as much as digits as its factorization.

261514645353719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648000, while the sum is 62.

The spelling of 261514645353719 in words is "two hundred sixty-one trillion, five hundred fourteen billion, six hundred forty-five million, three hundred fifty-three thousand, seven hundred nineteen".