191866343011 has 16 divisors (see below), whose sum is σ = 226433785600. Its totient is φ = 159158569248.

The previous prime is 191866343003. The next prime is 191866343047. The reversal of 191866343011 is 110343668191.

It is not a de Polignac number, because 191866343011 - 2³ = 191866343003 is a prime.

It is a super-2 number, since 2×191866343011² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191866340011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2891181 + ... + 2956798.

It is an arithmetic number, because the mean of its divisors is an integer number (14152111600).

Almost surely, 2^191866343011 is an apocalyptic number.

191866343011 is a deficient number, since it is larger than the sum of its proper divisors (34567442589).

191866343011 is a wasteful number, since it uses less digits than its factorization.

191866343011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5848138.

The product of its (nonzero) digits is 93312, while the sum is 43.

The spelling of 191866343011 in words is "one hundred ninety-one billion, eight hundred sixty-six million, three hundred forty-three thousand, eleven".