191815968768 has 96 divisors (see below), whose sum is σ = 511645942080. Its totient is φ = 63905955840.

The previous prime is 191815968763. The next prime is 191815968809. The reversal of 191815968768 is 867869518191.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (191815968763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14007621 + ... + 14021307.

It is an arithmetic number, because the mean of its divisors is an integer number (5329645230).

Almost surely, 2^191815968768 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 191815968768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (255822971040).

191815968768 is an abundant number, since it is smaller than the sum of its proper divisors (319829973312).

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

191815968768 is a wasteful number, since it uses less digits than its factorization.

191815968768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15993 (or 15973 counting only the distinct ones).

The product of its digits is 52254720, while the sum is 69.

The spelling of 191815968768 in words is "one hundred ninety-one billion, eight hundred fifteen million, nine hundred sixty-eight thousand, seven hundred sixty-eight".