66562220 has 12 divisors (see below), whose sum is σ = 139780704. Its totient is φ = 26624880.

The previous prime is 66562219. The next prime is 66562231. The reversal of 66562220 is 2226566.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1664036 + ... + 1664075.

It is an arithmetic number, because the mean of its divisors is an integer number (11648392).

Almost surely, 2^66562220 is an apocalyptic number.

It is an amenable number.

66562220 is an abundant number, since it is smaller than the sum of its proper divisors (73218484).

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

66562220 is a wasteful number, since it uses less digits than its factorization.

66562220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3328120 (or 3328118 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 66562220 is about 8158.5672761827. The cubic root of 66562220 is about 405.2682671148.

Adding to 66562220 its reverse (2226566), we get a palindrome (68788786).

The spelling of 66562220 in words is "sixty-six million, five hundred sixty-two thousand, two hundred twenty".