78614975221 has 2 divisors, whose sum is σ = 78614975222. Its totient is φ = 78614975220.

The previous prime is 78614975203. The next prime is 78614975227. The reversal of 78614975221 is 12257941687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76667518321 + 1947456900 = 276889^2 + 44130^2 .

It is an emirp because it is prime and its reverse (12257941687) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78614975221 - 2⁵ = 78614975189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78614975227) 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, 39307487610 + 39307487611.

It is an arithmetic number, because the mean of its divisors is an integer number (39307487611).

Almost surely, 2^78614975221 is an apocalyptic number.

It is an amenable number.

78614975221 is a deficient number, since it is larger than the sum of its proper divisors (1).

78614975221 is an equidigital number, since it uses as much as digits as its factorization.

78614975221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1693440, while the sum is 52.

The spelling of 78614975221 in words is "seventy-eight billion, six hundred fourteen million, nine hundred seventy-five thousand, two hundred twenty-one".