191678387933 has 4 divisors (see below), whose sum is σ = 201766724160. Its totient is φ = 181590051708.

The previous prime is 191678387903. The next prime is 191678387939. The reversal of 191678387933 is 339783876191.

191678387933 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 339783876191 = 59 ⋅5759048749.

It is a cyclic number.

It is not a de Polignac number, because 191678387933 - 2¹⁶ = 191678322397 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 191678387933.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191678387939) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5044168085 + ... + 5044168122.

It is an arithmetic number, because the mean of its divisors is an integer number (50441681040).

Almost surely, 2^191678387933 is an apocalyptic number.

It is an amenable number.

191678387933 is a deficient number, since it is larger than the sum of its proper divisors (10088336227).

191678387933 is a wasteful number, since it uses less digits than its factorization.

191678387933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10088336226.

The product of its digits is 41150592, while the sum is 65.

The spelling of 191678387933 in words is "one hundred ninety-one billion, six hundred seventy-eight million, three hundred eighty-seven thousand, nine hundred thirty-three".