16366984561 has 2 divisors, whose sum is σ = 16366984562. Its totient is φ = 16366984560.

The previous prime is 16366984553. The next prime is 16366984633. The reversal of 16366984561 is 16548966361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16344088336 + 22896225 = 127844^2 + 4785^2 .

It is a cyclic number.

It is not a de Polignac number, because 16366984561 - 2³ = 16366984553 is a prime.

It is not a weakly prime, because it can be changed into another prime (16366984061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8183492280 + 8183492281.

It is an arithmetic number, because the mean of its divisors is an integer number (8183492281).

Almost surely, 2^16366984561 is an apocalyptic number.

It is an amenable number.

16366984561 is a deficient number, since it is larger than the sum of its proper divisors (1).

16366984561 is an equidigital number, since it uses as much as digits as its factorization.

16366984561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5598720, while the sum is 55.

The spelling of 16366984561 in words is "sixteen billion, three hundred sixty-six million, nine hundred eighty-four thousand, five hundred sixty-one".