191426987268 has 36 divisors (see below), whose sum is σ = 527874420528. Its totient is φ = 58008177840.

The previous prime is 191426987251. The next prime is 191426987273. The reversal of 191426987268 is 862789624191.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 241700346 + ... + 241701137.

It is an arithmetic number, because the mean of its divisors is an integer number (14663178348).

Almost surely, 2^191426987268 is an apocalyptic number.

191426987268 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

191426987268 is an abundant number, since it is smaller than the sum of its proper divisors (336447433260).

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

191426987268 is a wasteful number, since it uses less digits than its factorization.

191426987268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483401504 (or 483401499 counting only the distinct ones).

The product of its digits is 20901888, while the sum is 63.

The spelling of 191426987268 in words is "one hundred ninety-one billion, four hundred twenty-six million, nine hundred eighty-seven thousand, two hundred sixty-eight".