18817801774448 has 20 divisors (see below), whose sum is σ = 38604166876080. Its totient is φ = 8855436129024.

The previous prime is 18817801774367. The next prime is 18817801774451. The reversal of 18817801774448 is 84447710871881.

It is a Harshad number since it is a multiple of its sum of digits (68).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34591547108 + ... + 34591547651.

It is an arithmetic number, because the mean of its divisors is an integer number (1930208343804).

Almost surely, 2^{18817801774448} is an apocalyptic number.

It is an amenable number.

18817801774448 is an abundant number, since it is smaller than the sum of its proper divisors (19786365101632).

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

18817801774448 is a wasteful number, since it uses less digits than its factorization.

18817801774448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69183094784 (or 69183094778 counting only the distinct ones).

The product of its (nonzero) digits is 89915392, while the sum is 68.

The spelling of 18817801774448 in words is "eighteen trillion, eight hundred seventeen billion, eight hundred one million, seven hundred seventy-four thousand, four hundred forty-eight".