18212154620508 has 168 divisors, whose sum is σ = 48515117455728. Its totient is φ = 5978653244928.

The previous prime is 18212154620483. The next prime is 18212154620557. The reversal of 18212154620508 is 80502645121281.

18212154620508 is a `hidden beast` number, since 1 + 8 + 2 + 1 + 2 + 15 + 4 + 620 + 5 + 0 + 8 = 666.

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 in 55 ways as a sum of consecutive naturals, for example, 51556735 + ... + 51908777.

It is an arithmetic number, because the mean of its divisors is an integer number (288780461046).

Almost surely, 2^{18212154620508} is an apocalyptic number.

18212154620508 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18212154620508, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24257558727864).

18212154620508 is an abundant number, since it is smaller than the sum of its proper divisors (30302962835220).

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

18212154620508 is a wasteful number, since it uses less digits than its factorization.

18212154620508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352335 (or 352318 counting only the distinct ones).

The product of its (nonzero) digits is 307200, while the sum is 45.

Adding to 18212154620508 its reverse (80502645121281), we get a palindrome (98714799741789).

The spelling of 18212154620508 in words is "eighteen trillion, two hundred twelve billion, one hundred fifty-four million, six hundred twenty thousand, five hundred eight".