78009959543 has 2 divisors, whose sum is σ = 78009959544. Its totient is φ = 78009959542.

The previous prime is 78009959513. The next prime is 78009959551. The reversal of 78009959543 is 34595990087.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78009959543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78009959513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39004979771 + 39004979772.

It is an arithmetic number, because the mean of its divisors is an integer number (39004979772).

Almost surely, 2^78009959543 is an apocalyptic number.

78009959543 is a deficient number, since it is larger than the sum of its proper divisors (1).

78009959543 is an equidigital number, since it uses as much as digits as its factorization.

78009959543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12247200, while the sum is 59.

The spelling of 78009959543 in words is "seventy-eight billion, nine million, nine hundred fifty-nine thousand, five hundred forty-three".