191178900056 has 16 divisors (see below), whose sum is σ = 370821142800. Its totient is φ = 92293261984.

The previous prime is 191178900019. The next prime is 191178900089. The reversal of 191178900056 is 650009871191.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 412023260 + ... + 412023723.

It is an arithmetic number, because the mean of its divisors is an integer number (23176321425).

Almost surely, 2^191178900056 is an apocalyptic number.

It is an amenable number.

191178900056 is a deficient number, since it is larger than the sum of its proper divisors (179642242744).

191178900056 is a wasteful number, since it uses less digits than its factorization.

191178900056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824047018 (or 824047014 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 47.

The spelling of 191178900056 in words is "one hundred ninety-one billion, one hundred seventy-eight million, nine hundred thousand, fifty-six".