191866343055 has 32 divisors (see below), whose sum is σ = 317605916160. Its totient is φ = 98789550720.

The previous prime is 191866343047. The next prime is 191866343057. The reversal of 191866343055 is 550343668191.

It is not a de Polignac number, because 191866343055 - 2³ = 191866343047 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 191866342989 and 191866343007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191866343057) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5546844 + ... + 5581326.

It is an arithmetic number, because the mean of its divisors is an integer number (9925184880).

Almost surely, 2^191866343055 is an apocalyptic number.

191866343055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

191866343055 is a deficient number, since it is larger than the sum of its proper divisors (125739573105).

191866343055 is a wasteful number, since it uses less digits than its factorization.

191866343055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47311.

The product of its (nonzero) digits is 2332800, while the sum is 51.

The spelling of 191866343055 in words is "one hundred ninety-one billion, eight hundred sixty-six million, three hundred forty-three thousand, fifty-five".