66541043 has 4 divisors (see below), whose sum is σ = 70455240. Its totient is φ = 62626848.

The previous prime is 66541039. The next prime is 66541087. The reversal of 66541043 is 34014566.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34014566 = 2 ⋅17007283.

It is a cyclic number.

It is not a de Polignac number, because 66541043 - 2² = 66541039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66540997 and 66541015.

It is not an unprimeable number, because it can be changed into a prime (66541003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1957073 + ... + 1957106.

It is an arithmetic number, because the mean of its divisors is an integer number (17613810).

Almost surely, 2^66541043 is an apocalyptic number.

66541043 is a deficient number, since it is larger than the sum of its proper divisors (3914197).

66541043 is a wasteful number, since it uses less digits than its factorization.

66541043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3914196.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 66541043 is about 8157.2693347713. The cubic root of 66541043 is about 405.2252833900.

The spelling of 66541043 in words is "sixty-six million, five hundred forty-one thousand, forty-three".