78289461389449 has 2 divisors, whose sum is σ = 78289461389450. Its totient is φ = 78289461389448.

The previous prime is 78289461389443. The next prime is 78289461389537. The reversal of 78289461389449 is 94498316498287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61588467100224 + 16700994289225 = 7847832^2 + 4086685^2 .

It is a cyclic number.

It is not a de Polignac number, because 78289461389449 - 2⁹ = 78289461388937 is a prime.

It is a super-2 number, since 2×78289461389449² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78289461389443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39144730694724 + 39144730694725.

It is an arithmetic number, because the mean of its divisors is an integer number (39144730694725).

Almost surely, 2^{78289461389449} is an apocalyptic number.

It is an amenable number.

78289461389449 is a deficient number, since it is larger than the sum of its proper divisors (1).

78289461389449 is an equidigital number, since it uses as much as digits as its factorization.

78289461389449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6019743744, while the sum is 82.

The spelling of 78289461389449 in words is "seventy-eight trillion, two hundred eighty-nine billion, four hundred sixty-one million, three hundred eighty-nine thousand, four hundred forty-nine".