191903841550 has 12 divisors (see below), whose sum is σ = 356941145376. Its totient is φ = 76761536600.

The previous prime is 191903841533. The next prime is 191903841559. The reversal of 191903841550 is 55148309191.

It is a self number, because there is not a number n which added to its sum of digits gives 191903841550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191903841559) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1919038366 + ... + 1919038465.

It is an arithmetic number, because the mean of its divisors is an integer number (29745095448).

Almost surely, 2^191903841550 is an apocalyptic number.

191903841550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

191903841550 is a deficient number, since it is larger than the sum of its proper divisors (165037303826).

191903841550 is a wasteful number, since it uses less digits than its factorization.

191903841550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3838076843 (or 3838076838 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 46.

The spelling of 191903841550 in words is "one hundred ninety-one billion, nine hundred three million, eight hundred forty-one thousand, five hundred fifty".