78589691647 has 2 divisors, whose sum is σ = 78589691648. Its totient is φ = 78589691646.

The previous prime is 78589691549. The next prime is 78589691651. The reversal of 78589691647 is 74619698587.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78589691647 - 2¹¹ = 78589689599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78589698647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39294845823 + 39294845824.

It is an arithmetic number, because the mean of its divisors is an integer number (39294845824).

Almost surely, 2^78589691647 is an apocalyptic number.

78589691647 is a deficient number, since it is larger than the sum of its proper divisors (1).

78589691647 is an equidigital number, since it uses as much as digits as its factorization.

78589691647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 182891520, while the sum is 70.

The spelling of 78589691647 in words is "seventy-eight billion, five hundred eighty-nine million, six hundred ninety-one thousand, six hundred forty-seven".