78871374643 has 2 divisors, whose sum is σ = 78871374644. Its totient is φ = 78871374642.

The previous prime is 78871374619. The next prime is 78871374653. The reversal of 78871374643 is 34647317887.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78871374643 - 2¹⁷ = 78871243571 is a prime.

It is not a weakly prime, because it can be changed into another prime (78871374613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39435687321 + 39435687322.

It is an arithmetic number, because the mean of its divisors is an integer number (39435687322).

Almost surely, 2^78871374643 is an apocalyptic number.

78871374643 is a deficient number, since it is larger than the sum of its proper divisors (1).

78871374643 is an equidigital number, since it uses as much as digits as its factorization.

78871374643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18966528, while the sum is 58.

The spelling of 78871374643 in words is "seventy-eight billion, eight hundred seventy-one million, three hundred seventy-four thousand, six hundred forty-three".