19778698642140 has 144 divisors (see below), whose sum is σ = 63162524224800. Its totient is φ = 4995973292544.

The previous prime is 19778698642111. The next prime is 19778698642163. The reversal of 19778698642140 is 4124689687791.

19778698642140 is a `hidden beast` number, since 1 + 9 + 7 + 7 + 86 + 9 + 86 + 421 + 40 = 666.

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 47 ways as a sum of consecutive naturals, for example, 22513774 + ... + 23375786.

It is an arithmetic number, because the mean of its divisors is an integer number (438628640450).

Almost surely, 2^{19778698642140} is an apocalyptic number.

19778698642140 is a gapful number since it is divisible by the number (10) 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 19778698642140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31581262112400).

19778698642140 is an abundant number, since it is smaller than the sum of its proper divisors (43383825582660).

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

19778698642140 is a wasteful number, since it uses less digits than its factorization.

19778698642140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868756 (or 868751 counting only the distinct ones).

The product of its (nonzero) digits is 292626432, while the sum is 72.

The spelling of 19778698642140 in words is "nineteen trillion, seven hundred seventy-eight billion, six hundred ninety-eight million, six hundred forty-two thousand, one hundred forty".