78603368521 has 2 divisors, whose sum is σ = 78603368522. Its totient is φ = 78603368520.

The previous prime is 78603368483. The next prime is 78603368567. The reversal of 78603368521 is 12586330687.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76156681225 + 2446687296 = 275965^2 + 49464^2 .

It is a cyclic number.

It is not a de Polignac number, because 78603368521 - 2⁹ = 78603368009 is a prime.

It is not a weakly prime, because it can be changed into another prime (78603368621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39301684260 + 39301684261.

It is an arithmetic number, because the mean of its divisors is an integer number (39301684261).

Almost surely, 2^78603368521 is an apocalyptic number.

It is an amenable number.

78603368521 is a deficient number, since it is larger than the sum of its proper divisors (1).

78603368521 is an equidigital number, since it uses as much as digits as its factorization.

78603368521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1451520, while the sum is 49.

The spelling of 78603368521 in words is "seventy-eight billion, six hundred three million, three hundred sixty-eight thousand, five hundred twenty-one".