19850641668 has 144 divisors (see below), whose sum is σ = 62418335616. Its totient is φ = 5225978880.

The previous prime is 19850641661. The next prime is 19850641691. The reversal of 19850641668 is 86614605891.

19850641668 is a `hidden beast` number, since 1 + 98 + 506 + 41 + 6 + 6 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (19850641661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 25896 + ... + 200927.

It is an arithmetic number, because the mean of its divisors is an integer number (433460664).

Almost surely, 2^19850641668 is an apocalyptic number.

19850641668 is a gapful number since it is divisible by the number (18) 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 19850641668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31209167808).

19850641668 is an abundant number, since it is smaller than the sum of its proper divisors (42567693948).

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

19850641668 is a wasteful number, since it uses less digits than its factorization.

19850641668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226874 (or 226869 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 54.

The spelling of 19850641668 in words is "nineteen billion, eight hundred fifty million, six hundred forty-one thousand, six hundred sixty-eight".