16643442412577 has 2 divisors, whose sum is σ = 16643442412578. Its totient is φ = 16643442412576.

The previous prime is 16643442412501. The next prime is 16643442412589. The reversal of 16643442412577 is 77521424434661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16344199497616 + 299242914961 = 4042796^2 + 547031^2 .

It is an emirp because it is prime and its reverse (77521424434661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16643442412577 - 2²² = 16643438218273 is a prime.

It is not a weakly prime, because it can be changed into another prime (16643442412277) 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, 8321721206288 + 8321721206289.

It is an arithmetic number, because the mean of its divisors is an integer number (8321721206289).

Almost surely, 2^{16643442412577} is an apocalyptic number.

It is an amenable number.

16643442412577 is a deficient number, since it is larger than the sum of its proper divisors (1).

16643442412577 is an equidigital number, since it uses as much as digits as its factorization.

16643442412577 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27095040, while the sum is 56.

The spelling of 16643442412577 in words is "sixteen trillion, six hundred forty-three billion, four hundred forty-two million, four hundred twelve thousand, five hundred seventy-seven".