19965034999806 has 192 divisors, whose sum is σ = 47313123399360. Its totient is φ = 5590771630080.

The previous prime is 19965034999781. The next prime is 19965034999933. The reversal of 19965034999806 is 60899943056991.

It is a Harshad number since it is a multiple of its sum of digits (78).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 79738660 + ... + 79988648.

It is an arithmetic number, because the mean of its divisors is an integer number (246422517705).

Almost surely, 2^{19965034999806} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19965034999806, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23656561699680).

19965034999806 is an abundant number, since it is smaller than the sum of its proper divisors (27348088399554).

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

19965034999806 is a wasteful number, since it uses less digits than its factorization.

19965034999806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250191 (or 250178 counting only the distinct ones).

The product of its (nonzero) digits is 1020366720, while the sum is 78.

The spelling of 19965034999806 in words is "nineteen trillion, nine hundred sixty-five billion, thirty-four million, nine hundred ninety-nine thousand, eight hundred six".