166035871559 has 4 divisors (see below), whose sum is σ = 167647870416. Its totient is φ = 164423872704.

The previous prime is 166035871427. The next prime is 166035871583. The reversal of 166035871559 is 955178530661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 955178530661 = 3191 ⋅299335171.

It is a cyclic number.

It is not a de Polignac number, because 166035871559 - 2²⁰ = 166034822983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166035801559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 805999274 + ... + 805999479.

It is an arithmetic number, because the mean of its divisors is an integer number (41911967604).

Almost surely, 2^166035871559 is an apocalyptic number.

166035871559 is a deficient number, since it is larger than the sum of its proper divisors (1611998857).

166035871559 is a wasteful number, since it uses less digits than its factorization.

166035871559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1611998856.

The product of its (nonzero) digits is 6804000, while the sum is 56.

The spelling of 166035871559 in words is "one hundred sixty-six billion, thirty-five million, eight hundred seventy-one thousand, five hundred fifty-nine".