19985570383856 has 120 divisors (see below), whose sum is σ = 49142971813680. Its totient is φ = 7785943603200.

The previous prime is 19985570383853. The next prime is 19985570383859. The reversal of 19985570383856 is 65838307558991.

It is an interprime number because it is at equal distance from previous prime (19985570383853) and next prime (19985570383859).

It is a Harshad number since it is a multiple of its sum of digits (77).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19985570383853) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 112100546 + ... + 112278686.

It is an arithmetic number, because the mean of its divisors is an integer number (409524765114).

Almost surely, 2^{19985570383856} is an apocalyptic number.

19985570383856 is a gapful number since it is divisible by the number (16) 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 19985570383856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24571485906840).

19985570383856 is an abundant number, since it is smaller than the sum of its proper divisors (29157401429824).

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

19985570383856 is a wasteful number, since it uses less digits than its factorization.

19985570383856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191183 (or 191170 counting only the distinct ones).

The product of its (nonzero) digits is 1959552000, while the sum is 77.

The spelling of 19985570383856 in words is "nineteen trillion, nine hundred eighty-five billion, five hundred seventy million, three hundred eighty-three thousand, eight hundred fifty-six".