9918212890624 has 56 divisors (see below), whose sum is σ = 20519188486560. Its totient is φ = 4788102660096.

The previous prime is 9918212890583. The next prime is 9918212890631. The reversal of 9918212890624 is 4260982128199.

It is a trimorphic number since its cube, 975663994040292454883456259918212890624, ends in 9918212890624.

It is a plaindrome in base 5.

It is a zygodrome in base 5.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 20636904 + ... + 21112039.

Almost surely, 2^{9918212890624} is an apocalyptic number.

It is an amenable number.

9918212890624 is an abundant number, since it is smaller than the sum of its proper divisors (10600975595936).

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

9918212890624 is an equidigital number, since it uses as much as digits as its factorization.

9918212890624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41748998 (or 41748974 counting only the distinct ones).

The product of its (nonzero) digits is 8957952, while the sum is 61.

The spelling of 9918212890624 in words is "nine trillion, nine hundred eighteen billion, two hundred twelve million, eight hundred ninety thousand, six hundred twenty-four".