16493645824561 has 2 divisors, whose sum is σ = 16493645824562. Its totient is φ = 16493645824560.

The previous prime is 16493645824519. The next prime is 16493645824633. The reversal of 16493645824561 is 16542854639461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13125984080400 + 3367661744161 = 3622980^2 + 1835119^2 .

It is an emirp because it is prime and its reverse (16542854639461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16493645824561 - 2⁷ = 16493645824433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16493645824493 and 16493645824502.

It is not a weakly prime, because it can be changed into another prime (16493646824561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8246822912280 + 8246822912281.

It is an arithmetic number, because the mean of its divisors is an integer number (8246822912281).

Almost surely, 2^{16493645824561} is an apocalyptic number.

It is an amenable number.

16493645824561 is a deficient number, since it is larger than the sum of its proper divisors (1).

16493645824561 is an equidigital number, since it uses as much as digits as its factorization.

16493645824561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 149299200, while the sum is 64.

The spelling of 16493645824561 in words is "sixteen trillion, four hundred ninety-three billion, six hundred forty-five million, eight hundred twenty-four thousand, five hundred sixty-one".