19849978509696 has 256 divisors, whose sum is σ = 62355988684800. Its totient is φ = 6194836316160.

The previous prime is 19849978509667. The next prime is 19849978509701. The reversal of 19849978509696 is 69690587994891.

19849978509696 is a `hidden beast` number, since 1 + 9 + 8 + 4 + 9 + 9 + 7 + 8 + 509 + 6 + 96 = 666.

It is a super-3 number, since 3×19849978509696³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10337181 + ... + 12106083.

It is an arithmetic number, because the mean of its divisors is an integer number (243578080800).

Almost surely, 2^{19849978509696} is an apocalyptic number.

19849978509696 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 19849978509696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31177994342400).

19849978509696 is an abundant number, since it is smaller than the sum of its proper divisors (42506010175104).

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

19849978509696 is a wasteful number, since it uses less digits than its factorization.

19849978509696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1769134 (or 1769116 counting only the distinct ones).

The product of its (nonzero) digits is 19046845440, while the sum is 90.

The spelling of 19849978509696 in words is "nineteen trillion, eight hundred forty-nine billion, nine hundred seventy-eight million, five hundred nine thousand, six hundred ninety-six".