66554424 has 48 divisors (see below), whose sum is σ = 181282920. Its totient is φ = 22057920.

The previous prime is 66554381. The next prime is 66554429. The reversal of 66554424 is 42445566.

66554424 is a `hidden beast` number, since 66 + 554 + 42 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66554429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10479 + ... + 15585.

Almost surely, 2^66554424 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 66554424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90641460).

66554424 is an abundant number, since it is smaller than the sum of its proper divisors (114728496).

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

66554424 is a wasteful number, since it uses less digits than its factorization.

66554424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5300 (or 5293 counting only the distinct ones).

The product of its digits is 115200, while the sum is 36.

The square root of 66554424 is about 8158.0894822256. The cubic root of 66554424 is about 405.2524443514.

The spelling of 66554424 in words is "sixty-six million, five hundred fifty-four thousand, four hundred twenty-four".