18628780081548 has 48 divisors (see below), whose sum is σ = 53498035109120. Its totient is φ = 4913084856384.

The previous prime is 18628780081547. The next prime is 18628780081553. The reversal of 18628780081548 is 84518008782681.

It is not an unprimeable number, because it can be changed into a prime (18628780081547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8529660118 + ... + 8529662301.

Almost surely, 2^{18628780081548} is an apocalyptic number.

It is an amenable number.

18628780081548 is an abundant number, since it is smaller than the sum of its proper divisors (34869255027572).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18628780081548 is a wasteful number, since it uses less digits than its factorization.

18628780081548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17059322446 (or 17059322444 counting only the distinct ones).

The product of its (nonzero) digits is 55050240, while the sum is 66.

The spelling of 18628780081548 in words is "eighteen trillion, six hundred twenty-eight billion, seven hundred eighty million, eighty-one thousand, five hundred forty-eight".