191123247078 has 12 divisors (see below), whose sum is σ = 414100368708. Its totient is φ = 63707749020.

The previous prime is 191123247067. The next prime is 191123247101. The reversal of 191123247078 is 870742321191.

191123247078 is a `hidden beast` number, since 1 + 91 + 1 + 23 + 2 + 470 + 78 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5308979068 + ... + 5308979103.

It is an arithmetic number, because the mean of its divisors is an integer number (34508364059).

Almost surely, 2^191123247078 is an apocalyptic number.

191123247078 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

191123247078 is an abundant number, since it is smaller than the sum of its proper divisors (222977121630).

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

191123247078 is a wasteful number, since it uses less digits than its factorization.

191123247078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10617958179 (or 10617958176 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The spelling of 191123247078 in words is "one hundred ninety-one billion, one hundred twenty-three million, two hundred forty-seven thousand, seventy-eight".