66260220 has 192 divisors, whose sum is σ = 223534080. Its totient is φ = 14487552.

The previous prime is 66260197. The next prime is 66260231. The reversal of 66260220 is 2206266.

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 251809 + ... + 252071.

It is an arithmetic number, because the mean of its divisors is an integer number (1164240).

Almost surely, 2^66260220 is an apocalyptic number.

66260220 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 66260220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111767040).

66260220 is an abundant number, since it is smaller than the sum of its proper divisors (157273860).

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

66260220 is a wasteful number, since it uses less digits than its factorization.

66260220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324 (or 322 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 66260220 is about 8140.0380834490. The cubic root of 66260220 is about 404.6544224789.

Adding to 66260220 its reverse (2206266), we get a palindrome (68466486).

The spelling of 66260220 in words is "sixty-six million, two hundred sixty thousand, two hundred twenty".