191508668816 has 40 divisors (see below), whose sum is σ = 389184435840. Its totient is φ = 91184102784.

The previous prime is 191508668759. The next prime is 191508668831. The reversal of 191508668816 is 618866805191.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3413606 + ... + 3469253.

It is an arithmetic number, because the mean of its divisors is an integer number (9729610896).

Almost surely, 2^191508668816 is an apocalyptic number.

191508668816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

191508668816 is an abundant number, since it is smaller than the sum of its proper divisors (197675767024).

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

191508668816 is a wasteful number, since it uses less digits than its factorization.

191508668816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6882951 (or 6882945 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 59.

The spelling of 191508668816 in words is "one hundred ninety-one billion, five hundred eight million, six hundred sixty-eight thousand, eight hundred sixteen".