78561303547 has 2 divisors, whose sum is σ = 78561303548. Its totient is φ = 78561303546.

The previous prime is 78561303529. The next prime is 78561303617. The reversal of 78561303547 is 74530316587.

It is a weak prime.

It is an emirp because it is prime and its reverse (74530316587) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78561303547 - 2¹⁹ = 78560779259 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78561303547.

It is not a weakly prime, because it can be changed into another prime (78561303347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39280651773 + 39280651774.

It is an arithmetic number, because the mean of its divisors is an integer number (39280651774).

Almost surely, 2^78561303547 is an apocalyptic number.

78561303547 is a deficient number, since it is larger than the sum of its proper divisors (1).

78561303547 is an equidigital number, since it uses as much as digits as its factorization.

78561303547 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2116800, while the sum is 49.

The spelling of 78561303547 in words is "seventy-eight billion, five hundred sixty-one million, three hundred three thousand, five hundred forty-seven".