18921854817248 has 24 divisors (see below), whose sum is σ = 37270671737040. Its totient is φ = 9456287392000.

The previous prime is 18921854817227. The next prime is 18921854817319. The reversal of 18921854817248 is 84271845812981.

It is a super-2 number, since 2×18921854817248² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144934253 + ... + 145064748.

It is an arithmetic number, because the mean of its divisors is an integer number (1552944655710).

Almost surely, 2^{18921854817248} is an apocalyptic number.

It is an amenable number.

18921854817248 is a deficient number, since it is larger than the sum of its proper divisors (18348816919792).

18921854817248 is a wasteful number, since it uses less digits than its factorization.

18921854817248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290001050 (or 290001042 counting only the distinct ones).

The product of its digits is 82575360, while the sum is 68.

The spelling of 18921854817248 in words is "eighteen trillion, nine hundred twenty-one billion, eight hundred fifty-four million, eight hundred seventeen thousand, two hundred forty-eight".