16564362461 has 2 divisors, whose sum is σ = 16564362462. Its totient is φ = 16564362460.

The previous prime is 16564362449. The next prime is 16564362511. The reversal of 16564362461 is 16426346561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8359444900 + 8204917561 = 91430^2 + 90581^2 .

It is an emirp because it is prime and its reverse (16426346561) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16564362461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16564352461) 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, 8282181230 + 8282181231.

It is an arithmetic number, because the mean of its divisors is an integer number (8282181231).

Almost surely, 2^16564362461 is an apocalyptic number.

It is an amenable number.

16564362461 is a deficient number, since it is larger than the sum of its proper divisors (1).

16564362461 is an equidigital number, since it uses as much as digits as its factorization.

16564362461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 622080, while the sum is 44.

The spelling of 16564362461 in words is "sixteen billion, five hundred sixty-four million, three hundred sixty-two thousand, four hundred sixty-one".