191871902378 has 16 divisors (see below), whose sum is σ = 315200259360. Its totient is φ = 87055308336.

The previous prime is 191871902357. The next prime is 191871902423. The reversal of 191871902378 is 873209178191.

It is a happy number.

191871902378 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62538200 + ... + 62541267.

It is an arithmetic number, because the mean of its divisors is an integer number (19700016210).

Almost surely, 2^191871902378 is an apocalyptic number.

191871902378 is a deficient number, since it is larger than the sum of its proper divisors (123328356982).

191871902378 is a wasteful number, since it uses less digits than its factorization.

191871902378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125079541.

The product of its (nonzero) digits is 1524096, while the sum is 56.

The spelling of 191871902378 in words is "one hundred ninety-one billion, eight hundred seventy-one million, nine hundred two thousand, three hundred seventy-eight".