7978517689147 has 2 divisors, whose sum is σ = 7978517689148. Its totient is φ = 7978517689146.

The previous prime is 7978517689049. The next prime is 7978517689157. The reversal of 7978517689147 is 7419867158797.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (7419867158797) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7978517689147 - 2²³ = 7978509300539 is a prime.

It is not a weakly prime, because it can be changed into another prime (7978517689157) 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, 3989258844573 + 3989258844574.

It is an arithmetic number, because the mean of its divisors is an integer number (3989258844574).

Almost surely, 2^{7978517689147} is an apocalyptic number.

7978517689147 is a deficient number, since it is larger than the sum of its proper divisors (1).

7978517689147 is an equidigital number, since it uses as much as digits as its factorization.

7978517689147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1493614080, while the sum is 79.

The spelling of 7978517689147 in words is "seven trillion, nine hundred seventy-eight billion, five hundred seventeen million, six hundred eighty-nine thousand, one hundred forty-seven".