Almost surely, 266553380 is an apocalyptic number.
66553380 is a gapful number since it is divisible by the number (60) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 66553380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106357440).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
66553380 is a wasteful number, since it uses less digits than its factorization.
66553380 is an evil number, because the sum of its binary digits is even.
The square root of 66553380 is about 8158.0254964054. The cubic root of 66553380 is about 405.2503253549.
The spelling of 66553380 in words is "sixty-six million, five hundred fifty-three thousand, three hundred eighty".