78549894587 has 2 divisors, whose sum is σ = 78549894588. Its totient is φ = 78549894586.

The previous prime is 78549894583. The next prime is 78549894611.

78549894587 is nontrivially palindromic in base 10.

It is a weak prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 78549894587 - 2² = 78549894583 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 (78549894581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39274947293 + 39274947294.

It is an arithmetic number, because the mean of its divisors is an integer number (39274947294).

Almost surely, 2^78549894587 is an apocalyptic number.

78549894587 is a deficient number, since it is larger than the sum of its proper divisors (1).

78549894587 is an equidigital number, since it uses as much as digits as its factorization.

78549894587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 812851200, while the sum is 74.

The spelling of 78549894587 in words is "seventy-eight billion, five hundred forty-nine million, eight hundred ninety-four thousand, five hundred eighty-seven".