8549781816428 has 12 divisors (see below), whose sum is σ = 14965646177832. Its totient is φ = 4273882908480.

The previous prime is 8549781816427. The next prime is 8549781816437. The reversal of 8549781816428 is 8246181879458.

It is not an unprimeable number, because it can be changed into a prime (8549781816427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251980850 + ... + 252014777.

It is an arithmetic number, because the mean of its divisors is an integer number (1247137181486).

Almost surely, 2^{8549781816428} is an apocalyptic number.

It is an amenable number.

8549781816428 is a deficient number, since it is larger than the sum of its proper divisors (6415864361404).

8549781816428 is a wasteful number, since it uses less digits than its factorization.

8549781816428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503999872 (or 503999870 counting only the distinct ones).

The product of its digits is 247726080, while the sum is 71.

The spelling of 8549781816428 in words is "eight trillion, five hundred forty-nine billion, seven hundred eighty-one million, eight hundred sixteen thousand, four hundred twenty-eight".