16423503053561 has 2 divisors, whose sum is σ = 16423503053562. Its totient is φ = 16423503053560.

The previous prime is 16423503053491. The next prime is 16423503053563. The reversal of 16423503053561 is 16535030532461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16246897193536 + 176605860025 = 4030744^2 + 420245^2 .

It is a cyclic number.

It is not a de Polignac number, because 16423503053561 - 2¹⁸ = 16423502791417 is a prime.

Together with 16423503053563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16423503053563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8211751526780 + 8211751526781.

It is an arithmetic number, because the mean of its divisors is an integer number (8211751526781).

Almost surely, 2^{16423503053561} is an apocalyptic number.

It is an amenable number.

16423503053561 is a deficient number, since it is larger than the sum of its proper divisors (1).

16423503053561 is an equidigital number, since it uses as much as digits as its factorization.

16423503053561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972000, while the sum is 44.

The spelling of 16423503053561 in words is "sixteen trillion, four hundred twenty-three billion, five hundred three million, fifty-three thousand, five hundred sixty-one".