261563350453423 has 2 divisors, whose sum is σ = 261563350453424. Its totient is φ = 261563350453422.

The previous prime is 261563350453417. The next prime is 261563350453549. The reversal of 261563350453423 is 324354053365162.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261563350453423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261563350454423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130781675226711 + 130781675226712.

It is an arithmetic number, because the mean of its divisors is an integer number (130781675226712).

Almost surely, 2^{261563350453423} is an apocalyptic number.

261563350453423 is a deficient number, since it is larger than the sum of its proper divisors (1).

261563350453423 is an equidigital number, since it uses as much as digits as its factorization.

261563350453423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328000, while the sum is 52.

The spelling of 261563350453423 in words is "two hundred sixty-one trillion, five hundred sixty-three billion, three hundred fifty million, four hundred fifty-three thousand, four hundred twenty-three".