66554280 has 96 divisors (see below), whose sum is σ = 232956360. Its totient is φ = 16381440.

The previous prime is 66554263. The next prime is 66554287. The reversal of 66554280 is 8245566.

It can be written as a sum of positive squares in 4 ways, for example, as 47527236 + 19027044 = 6894^2 + 4362^2 .

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

It is not an unprimeable number, because it can be changed into a prime (66554287) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2431 + ... + 11790.

Almost surely, 2^66554280 is an apocalyptic number.

66554280 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 66554280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116478180).

66554280 is an abundant number, since it is smaller than the sum of its proper divisors (166402080).

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

66554280 is a wasteful number, since it uses less digits than its factorization.

66554280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14251 (or 14244 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 66554280 is about 8158.0806566251. The cubic root of 66554280 is about 405.2521520773.

It can be divided in two parts, 665 and 54280, that added together give a palindrome (54945).

The spelling of 66554280 in words is "sixty-six million, five hundred fifty-four thousand, two hundred eighty".