191303831568 has 80 divisors (see below), whose sum is σ = 504021419136. Its totient is φ = 62503234560.

The previous prime is 191303831549. The next prime is 191303831569. The reversal of 191303831568 is 865138303191.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (191303831569) 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 15 ways as a sum of consecutive naturals, for example, 2586396 + ... + 2659332.

Almost surely, 2^191303831568 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 191303831568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (252010709568).

191303831568 is an abundant number, since it is smaller than the sum of its proper divisors (312717587568).

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

191303831568 is a wasteful number, since it uses less digits than its factorization.

191303831568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74032 (or 74026 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 48.

The spelling of 191303831568 in words is "one hundred ninety-one billion, three hundred three million, eight hundred thirty-one thousand, five hundred sixty-eight".