77730032646221 has 2 divisors, whose sum is σ = 77730032646222. Its totient is φ = 77730032646220.

The previous prime is 77730032646169. The next prime is 77730032646229. The reversal of 77730032646221 is 12264623003777.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41626626496900 + 36103406149321 = 6451870^2 + 6008611^2 .

It is a cyclic number.

It is not a de Polignac number, because 77730032646221 - 2⁶ = 77730032646157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77730032646221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77730032646229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38865016323110 + 38865016323111.

It is an arithmetic number, because the mean of its divisors is an integer number (38865016323111).

Almost surely, 2^{77730032646221} is an apocalyptic number.

It is an amenable number.

77730032646221 is a deficient number, since it is larger than the sum of its proper divisors (1).

77730032646221 is an equidigital number, since it uses as much as digits as its factorization.

77730032646221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3556224, while the sum is 50.

Adding to 77730032646221 its reverse (12264623003777), we get a palindrome (89994655649998).

The spelling of 77730032646221 in words is "seventy-seven trillion, seven hundred thirty billion, thirty-two million, six hundred forty-six thousand, two hundred twenty-one".