16358321561 has 2 divisors, whose sum is σ = 16358321562. Its totient is φ = 16358321560.

The previous prime is 16358321531. The next prime is 16358321597. The reversal of 16358321561 is 16512385361.

16358321561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11997039961 + 4361281600 = 109531^2 + 66040^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16358321561 is a prime.

It is not a weakly prime, because it can be changed into another prime (16358321531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8179160780 + 8179160781.

It is an arithmetic number, because the mean of its divisors is an integer number (8179160781).

Almost surely, 2^16358321561 is an apocalyptic number.

It is an amenable number.

16358321561 is a deficient number, since it is larger than the sum of its proper divisors (1).

16358321561 is an equidigital number, since it uses as much as digits as its factorization.

16358321561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129600, while the sum is 41.

The spelling of 16358321561 in words is "sixteen billion, three hundred fifty-eight million, three hundred twenty-one thousand, five hundred sixty-one".