191866343053 has 8 divisors (see below), whose sum is σ = 239209986240. Its totient is φ = 149506241280.

The previous prime is 191866343047. The next prime is 191866343057. The reversal of 191866343053 is 350343668191.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 191866343053 - 2³⁷ = 54427389581 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 191866342988 and 191866343006.

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 7 ways as a sum of consecutive naturals, for example, 1245885268 + ... + 1245885421.

It is an arithmetic number, because the mean of its divisors is an integer number (29901248280).

Almost surely, 2^191866343053 is an apocalyptic number.

It is an amenable number.

191866343053 is a deficient number, since it is larger than the sum of its proper divisors (47343643187).

191866343053 is a wasteful number, since it uses less digits than its factorization.

191866343053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2491770707.

The product of its (nonzero) digits is 1399680, while the sum is 49.

The spelling of 191866343053 in words is "one hundred ninety-one billion, eight hundred sixty-six million, three hundred forty-three thousand, fifty-three".