18221054548 has 6 divisors (see below), whose sum is σ = 31886845466. Its totient is φ = 9110527272.

The previous prime is 18221054513. The next prime is 18221054561. The reversal of 18221054548 is 84545012281.

It can be written as a sum of positive squares in only one way, i.e., 15608004624 + 2613049924 = 124932^2 + 51118^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18221054548.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2277631815 + ... + 2277631822.

Almost surely, 2^18221054548 is an apocalyptic number.

It is an amenable number.

18221054548 is a deficient number, since it is larger than the sum of its proper divisors (13665790918).

18221054548 is a wasteful number, since it uses less digits than its factorization.

18221054548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4555263641 (or 4555263639 counting only the distinct ones).

The product of its (nonzero) digits is 102400, while the sum is 40.

The spelling of 18221054548 in words is "eighteen billion, two hundred twenty-one million, fifty-four thousand, five hundred forty-eight".