16805425160521 has 2 divisors, whose sum is σ = 16805425160522. Its totient is φ = 16805425160520.

The previous prime is 16805425160497. The next prime is 16805425160543. The reversal of 16805425160521 is 12506152450861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14547633426496 + 2257791734025 = 3814136^2 + 1502595^2 .

It is an emirp because it is prime and its reverse (12506152450861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16805425160521 - 2¹⁵ = 16805425127753 is a prime.

It is not a weakly prime, because it can be changed into another prime (16805425160551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8402712580260 + 8402712580261.

It is an arithmetic number, because the mean of its divisors is an integer number (8402712580261).

Almost surely, 2^{16805425160521} is an apocalyptic number.

It is an amenable number.

16805425160521 is a deficient number, since it is larger than the sum of its proper divisors (1).

16805425160521 is an equidigital number, since it uses as much as digits as its factorization.

16805425160521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576000, while the sum is 46.

The spelling of 16805425160521 in words is "sixteen trillion, eight hundred five billion, four hundred twenty-five million, one hundred sixty thousand, five hundred twenty-one".