78549494887 has 2 divisors, whose sum is σ = 78549494888. Its totient is φ = 78549494886.

The previous prime is 78549494869. The next prime is 78549494911. The reversal of 78549494887 is 78849494587.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78549494887 - 2⁷ = 78549494759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78549494587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39274747443 + 39274747444.

It is an arithmetic number, because the mean of its divisors is an integer number (39274747444).

Almost surely, 2^78549494887 is an apocalyptic number.

78549494887 is a deficient number, since it is larger than the sum of its proper divisors (1).

78549494887 is an equidigital number, since it uses as much as digits as its factorization.

78549494887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 650280960, while the sum is 73.

The spelling of 78549494887 in words is "seventy-eight billion, five hundred forty-nine million, four hundred ninety-four thousand, eight hundred eighty-seven".