66533844 has 48 divisors (see below), whose sum is σ = 171721088. Its totient is φ = 19916928.

The previous prime is 66533837. The next prime is 66533861. The reversal of 66533844 is 44833566.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 9 + ... + 11535.

Almost surely, 2^66533844 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66533844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85860544).

66533844 is an abundant number, since it is smaller than the sum of its proper divisors (105187244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66533844 is a wasteful number, since it uses less digits than its factorization.

66533844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11584 (or 11582 counting only the distinct ones).

The product of its digits is 207360, while the sum is 39.

The square root of 66533844 is about 8156.8280599753. The cubic root of 66533844 is about 405.2106692417.

The spelling of 66533844 in words is "sixty-six million, five hundred thirty-three thousand, eight hundred forty-four".