19986258361212 has 768 divisors, whose sum is σ = 64221169582080. Its totient is φ = 5292190080000.

The previous prime is 19986258361169. The next prime is 19986258361261. The reversal of 19986258361212 is 21216385268991.

19986258361212 is a `hidden beast` number, since 1 + 9 + 9 + 8 + 6 + 2 + 5 + 8 + 3 + 612 + 1 + 2 = 666.

It is a super-2 number, since 2×19986258361212² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19986258361212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 5578077573 + ... + 5578081155.

It is an arithmetic number, because the mean of its divisors is an integer number (83621314560).

Almost surely, 2^{19986258361212} is an apocalyptic number.

19986258361212 is a gapful number since it is divisible by the number (12) 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 19986258361212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32110584791040).

19986258361212 is an abundant number, since it is smaller than the sum of its proper divisors (44234911220868).

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

19986258361212 is a wasteful number, since it uses less digits than its factorization.

19986258361212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3903 (or 3895 counting only the distinct ones).

The product of its digits is 22394880, while the sum is 63.

The spelling of 19986258361212 in words is "nineteen trillion, nine hundred eighty-six billion, two hundred fifty-eight million, three hundred sixty-one thousand, two hundred twelve".