78549494587 has 2 divisors, whose sum is σ = 78549494588. Its totient is φ = 78549494586.

The previous prime is 78549494579. The next prime is 78549494657.

78549494587 is nontrivially palindromic in base 10.

It is an a-pointer prime, because the next prime (78549494657) can be obtained adding 78549494587 to its sum of digits (70).

It is a weak prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 78549494587 - 2³ = 78549494579 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (78549494887) 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, 39274747293 + 39274747294.

It is an arithmetic number, because the mean of its divisors is an integer number (39274747294).

Almost surely, 2^78549494587 is an apocalyptic number.

78549494587 is a deficient number, since it is larger than the sum of its proper divisors (1).

78549494587 is an equidigital number, since it uses as much as digits as its factorization.

78549494587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 406425600, while the sum is 70.

The spelling of 78549494587 in words is "seventy-eight billion, five hundred forty-nine million, four hundred ninety-four thousand, five hundred eighty-seven".