261563141519 has 2 divisors, whose sum is σ = 261563141520. Its totient is φ = 261563141518.

The previous prime is 261563141491. The next prime is 261563141549. The reversal of 261563141519 is 915141365162.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261563141519 - 2²⁸ = 261294706063 is a prime.

It is a super-2 number, since 2×261563141519² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 261563141519.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261563141549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130781570759 + 130781570760.

It is an arithmetic number, because the mean of its divisors is an integer number (130781570760).

Almost surely, 2^261563141519 is an apocalyptic number.

261563141519 is a deficient number, since it is larger than the sum of its proper divisors (1).

261563141519 is an equidigital number, since it uses as much as digits as its factorization.

261563141519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 194400, while the sum is 44.

The spelling of 261563141519 in words is "two hundred sixty-one billion, five hundred sixty-three million, one hundred forty-one thousand, five hundred nineteen".