75785108221 has 2 divisors, whose sum is σ = 75785108222. Its totient is φ = 75785108220.

The previous prime is 75785108213. The next prime is 75785108239. The reversal of 75785108221 is 12280158757.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47584623321 + 28200484900 = 218139^2 + 167930^2 .

It is an emirp because it is prime and its reverse (12280158757) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 75785108221 - 2³ = 75785108213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75785108281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37892554110 + 37892554111.

It is an arithmetic number, because the mean of its divisors is an integer number (37892554111).

Almost surely, 2^75785108221 is an apocalyptic number.

It is an amenable number.

75785108221 is a deficient number, since it is larger than the sum of its proper divisors (1).

75785108221 is an equidigital number, since it uses as much as digits as its factorization.

75785108221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 313600, while the sum is 46.

The spelling of 75785108221 in words is "seventy-five billion, seven hundred eighty-five million, one hundred eight thousand, two hundred twenty-one".