78005693321 has 2 divisors, whose sum is σ = 78005693322. Its totient is φ = 78005693320.

The previous prime is 78005693303. The next prime is 78005693323. The reversal of 78005693321 is 12339650087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64483492096 + 13522201225 = 253936^2 + 116285^2 .

It is a cyclic number.

It is not a de Polignac number, because 78005693321 - 2¹⁸ = 78005431177 is a prime.

Together with 78005693323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78005693323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39002846660 + 39002846661.

It is an arithmetic number, because the mean of its divisors is an integer number (39002846661).

Almost surely, 2^78005693321 is an apocalyptic number.

It is an amenable number.

78005693321 is a deficient number, since it is larger than the sum of its proper divisors (1).

78005693321 is an equidigital number, since it uses as much as digits as its factorization.

78005693321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 272160, while the sum is 44.

The spelling of 78005693321 in words is "seventy-eight billion, five million, six hundred ninety-three thousand, three hundred twenty-one".