78643007249 has 2 divisors, whose sum is σ = 78643007250. Its totient is φ = 78643007248.

The previous prime is 78643007243. The next prime is 78643007269. The reversal of 78643007249 is 94270034687.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64684766224 + 13958241025 = 254332^2 + 118145^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78643007249 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78643007197 and 78643007206.

It is not a weakly prime, because it can be changed into another prime (78643007243) 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, 39321503624 + 39321503625.

It is an arithmetic number, because the mean of its divisors is an integer number (39321503625).

Almost surely, 2^78643007249 is an apocalyptic number.

It is an amenable number.

78643007249 is a deficient number, since it is larger than the sum of its proper divisors (1).

78643007249 is an equidigital number, since it uses as much as digits as its factorization.

78643007249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2032128, while the sum is 50.

The spelling of 78643007249 in words is "seventy-eight billion, six hundred forty-three million, seven thousand, two hundred forty-nine".