74436575221 has 2 divisors, whose sum is σ = 74436575222. Its totient is φ = 74436575220.

The previous prime is 74436575219. The next prime is 74436575243. The reversal of 74436575221 is 12257563447.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70889062500 + 3547512721 = 266250^2 + 59561^2 .

It is an emirp because it is prime and its reverse (12257563447) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74436575221 - 2¹ = 74436575219 is a prime.

Together with 74436575219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74436575281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37218287610 + 37218287611.

It is an arithmetic number, because the mean of its divisors is an integer number (37218287611).

Almost surely, 2^74436575221 is an apocalyptic number.

It is an amenable number.

74436575221 is a deficient number, since it is larger than the sum of its proper divisors (1).

74436575221 is an equidigital number, since it uses as much as digits as its factorization.

74436575221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1411200, while the sum is 46.

The spelling of 74436575221 in words is "seventy-four billion, four hundred thirty-six million, five hundred seventy-five thousand, two hundred twenty-one".