66533456 has 40 divisors (see below), whose sum is σ = 141981984. Its totient is φ = 29951360.

The previous prime is 66533449. The next prime is 66533483. The reversal of 66533456 is 65433566.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17066 + ... + 20598.

Almost surely, 2^66533456 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 66533456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70990992).

66533456 is an abundant number, since it is smaller than the sum of its proper divisors (75448528).

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

66533456 is a wasteful number, since it uses less digits than its factorization.

66533456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3659 (or 3653 counting only the distinct ones).

The product of its digits is 194400, while the sum is 38.

The square root of 66533456 is about 8156.8042761856. The cubic root of 66533456 is about 405.2098815621.

The spelling of 66533456 in words is "sixty-six million, five hundred thirty-three thousand, four hundred fifty-six".