78443778671 has 2 divisors, whose sum is σ = 78443778672. Its totient is φ = 78443778670.

The previous prime is 78443778583. The next prime is 78443778719. The reversal of 78443778671 is 17687734487.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78443778671 - 2¹⁰ = 78443777647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78443778971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39221889335 + 39221889336.

It is an arithmetic number, because the mean of its divisors is an integer number (39221889336).

Almost surely, 2^78443778671 is an apocalyptic number.

78443778671 is a deficient number, since it is larger than the sum of its proper divisors (1).

78443778671 is an equidigital number, since it uses as much as digits as its factorization.

78443778671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 44255232, while the sum is 62.

The spelling of 78443778671 in words is "seventy-eight billion, four hundred forty-three million, seven hundred seventy-eight thousand, six hundred seventy-one".