19986521745750 has 256 divisors, whose sum is σ = 60409024266240. Its totient is φ = 4296605952000.

The previous prime is 19986521745727. The next prime is 19986521745851. The reversal of 19986521745750 is 5754712568991.

It is a super-2 number, since 2×19986521745750² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 128352940 + ... + 128508560.

It is an arithmetic number, because the mean of its divisors is an integer number (235972751040).

Almost surely, 2^{19986521745750} is an apocalyptic number.

19986521745750 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19986521745750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30204512133120).

19986521745750 is an abundant number, since it is smaller than the sum of its proper divisors (40422502520490).

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

19986521745750 is a wasteful number, since it uses less digits than its factorization.

19986521745750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157104 (or 157094 counting only the distinct ones).

The product of its (nonzero) digits is 190512000, while the sum is 69.

The spelling of 19986521745750 in words is "nineteen trillion, nine hundred eighty-six billion, five hundred twenty-one million, seven hundred forty-five thousand, seven hundred fifty".