161305564451 has 2 divisors, whose sum is σ = 161305564452. Its totient is φ = 161305564450.

The previous prime is 161305564417. The next prime is 161305564547. The reversal of 161305564451 is 154465503161.

161305564451 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 is a cyclic number.

It is not a de Polignac number, because 161305564451 - 2¹⁰ = 161305563427 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161305564399 and 161305564408.

It is not a weakly prime, because it can be changed into another prime (161305564751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80652782225 + 80652782226.

It is an arithmetic number, because the mean of its divisors is an integer number (80652782226).

Almost surely, 2^161305564451 is an apocalyptic number.

161305564451 is a deficient number, since it is larger than the sum of its proper divisors (1).

161305564451 is an equidigital number, since it uses as much as digits as its factorization.

161305564451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216000, while the sum is 41.

The spelling of 161305564451 in words is "one hundred sixty-one billion, three hundred five million, five hundred sixty-four thousand, four hundred fifty-one".