66011843 has 4 divisors (see below), whose sum is σ = 66196080. Its totient is φ = 65827608.

The previous prime is 66011797. The next prime is 66011887. The reversal of 66011843 is 34811066.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34811066 = 2 ⋅17405533.

It is a cyclic number.

It is not a de Polignac number, because 66011843 - 2⁶ = 66011779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66011443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91580 + ... + 92297.

It is an arithmetic number, because the mean of its divisors is an integer number (16549020).

Almost surely, 2^66011843 is an apocalyptic number.

66011843 is a deficient number, since it is larger than the sum of its proper divisors (184237).

66011843 is a wasteful number, since it uses less digits than its factorization.

66011843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184236.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 66011843 is about 8124.7672582050. The cubic root of 66011843 is about 404.1481725386.

The spelling of 66011843 in words is "sixty-six million, eleven thousand, eight hundred forty-three".