75306885221 has 2 divisors, whose sum is σ = 75306885222. Its totient is φ = 75306885220.

The previous prime is 75306885217. The next prime is 75306885239. The reversal of 75306885221 is 12258860357.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66210494596 + 9096390625 = 257314^2 + 95375^2 .

It is an emirp because it is prime and its reverse (12258860357) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 75306885221 - 2² = 75306885217 is a prime.

It is a super-2 number, since 2×75306885221² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75306885421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37653442610 + 37653442611.

It is an arithmetic number, because the mean of its divisors is an integer number (37653442611).

Almost surely, 2^75306885221 is an apocalyptic number.

It is an amenable number.

75306885221 is a deficient number, since it is larger than the sum of its proper divisors (1).

75306885221 is an equidigital number, since it uses as much as digits as its factorization.

75306885221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 806400, while the sum is 47.

The spelling of 75306885221 in words is "seventy-five billion, three hundred six million, eight hundred eighty-five thousand, two hundred twenty-one".