66025220 has 24 divisors (see below), whose sum is σ = 139273344. Its totient is φ = 26291936.

The previous prime is 66025207. The next prime is 66025231. The reversal of 66025220 is 2252066.

It is a happy 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, 2732 + ... + 11811.

It is an arithmetic number, because the mean of its divisors is an integer number (5803056).

Almost surely, 2^66025220 is an apocalyptic number.

It is an amenable number.

66025220 is an abundant number, since it is smaller than the sum of its proper divisors (73248124).

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

66025220 is a wasteful number, since it uses less digits than its factorization.

66025220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14779 (or 14777 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 66025220 is about 8125.5904400850. The cubic root of 66025220 is about 404.1754702916.

Adding to 66025220 its reverse (2252066), we get a palindrome (68277286).

The spelling of 66025220 in words is "sixty-six million, twenty-five thousand, two hundred twenty".