78888398647 has 2 divisors, whose sum is σ = 78888398648. Its totient is φ = 78888398646.

The previous prime is 78888398627. The next prime is 78888398723. The reversal of 78888398647 is 74689388887.

It is an a-pointer prime, because the next prime (78888398723) can be obtained adding 78888398647 to its sum of digits (76).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78888398647 - 2²³ = 78880010039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78888398627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39444199323 + 39444199324.

It is an arithmetic number, because the mean of its divisors is an integer number (39444199324).

Almost surely, 2^78888398647 is an apocalyptic number.

78888398647 is a deficient number, since it is larger than the sum of its proper divisors (1).

78888398647 is an equidigital number, since it uses as much as digits as its factorization.

78888398647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1040449536, while the sum is 76.

The spelling of 78888398647 in words is "seventy-eight billion, eight hundred eighty-eight million, three hundred ninety-eight thousand, six hundred forty-seven".