78247241268649 has 2 divisors, whose sum is σ = 78247241268650. Its totient is φ = 78247241268648.

The previous prime is 78247241268641. The next prime is 78247241268701. The reversal of 78247241268649 is 94686214274287.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75083264803600 + 3163976465049 = 8665060^2 + 1778757^2 .

It is a cyclic number.

It is not a de Polignac number, because 78247241268649 - 2³ = 78247241268641 is a prime.

It is a super-2 number, since 2×78247241268649² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78247241268641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39123620634324 + 39123620634325.

It is an arithmetic number, because the mean of its divisors is an integer number (39123620634325).

Almost surely, 2^{78247241268649} is an apocalyptic number.

It is an amenable number.

78247241268649 is a deficient number, since it is larger than the sum of its proper divisors (1).

78247241268649 is an equidigital number, since it uses as much as digits as its factorization.

78247241268649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 520224768, while the sum is 70.

The spelling of 78247241268649 in words is "seventy-eight trillion, two hundred forty-seven billion, two hundred forty-one million, two hundred sixty-eight thousand, six hundred forty-nine".