78776846387 has 2 divisors, whose sum is σ = 78776846388. Its totient is φ = 78776846386.

The previous prime is 78776846359. The next prime is 78776846437. The reversal of 78776846387 is 78364867787.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78776846387 - 2¹⁴ = 78776830003 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78776846387.

It is not a weakly prime, because it can be changed into another prime (78776846327) 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, 39388423193 + 39388423194.

It is an arithmetic number, because the mean of its divisors is an integer number (39388423194).

Almost surely, 2^78776846387 is an apocalyptic number.

78776846387 is a deficient number, since it is larger than the sum of its proper divisors (1).

78776846387 is an equidigital number, since it uses as much as digits as its factorization.

78776846387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 531062784, while the sum is 71.

The spelling of 78776846387 in words is "seventy-eight billion, seven hundred seventy-six million, eight hundred forty-six thousand, three hundred eighty-seven".