18281961750529 has 16 divisors (see below), whose sum is σ = 19399396208976. Its totient is φ = 17169217228800.

The previous prime is 18281961750511. The next prime is 18281961750581. The reversal of 18281961750529 is 92505716918281.

It can be written as a sum of positive squares in 8 ways, for example, as 11021850225 + 18270939900304 = 104985^2 + 4274452^2 .

It is a cyclic number.

It is not a de Polignac number, because 18281961750529 - 2¹³ = 18281961742337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18281961750599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28385379 + ... + 29022295.

It is an arithmetic number, because the mean of its divisors is an integer number (1212462263061).

Almost surely, 2^{18281961750529} is an apocalyptic number.

It is an amenable number.

18281961750529 is a deficient number, since it is larger than the sum of its proper divisors (1117434458447).

18281961750529 is a wasteful number, since it uses less digits than its factorization.

18281961750529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640596.

The product of its (nonzero) digits is 21772800, while the sum is 64.

The spelling of 18281961750529 in words is "eighteen trillion, two hundred eighty-one billion, nine hundred sixty-one million, seven hundred fifty thousand, five hundred twenty-nine".