78788646329 has 2 divisors, whose sum is σ = 78788646330. Its totient is φ = 78788646328.

The previous prime is 78788646281. The next prime is 78788646379. The reversal of 78788646329 is 92364688787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67002287104 + 11786359225 = 258848^2 + 108565^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78788646329 is a prime.

It is not a weakly prime, because it can be changed into another prime (78788646379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39394323164 + 39394323165.

It is an arithmetic number, because the mean of its divisors is an integer number (39394323165).

Almost surely, 2^78788646329 is an apocalyptic number.

It is an amenable number.

78788646329 is a deficient number, since it is larger than the sum of its proper divisors (1).

78788646329 is an equidigital number, since it uses as much as digits as its factorization.

78788646329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 195084288, while the sum is 68.

The spelling of 78788646329 in words is "seventy-eight billion, seven hundred eighty-eight million, six hundred forty-six thousand, three hundred twenty-nine".