66385572 has 24 divisors (see below), whose sum is σ = 168981792. Its totient is φ = 20116800.

The previous prime is 66385559. The next prime is 66385577. The reversal of 66385572 is 27558366.

It is not an unprimeable number, because it can be changed into a prime (66385577) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 251329 + ... + 251592.

It is an arithmetic number, because the mean of its divisors is an integer number (7040908).

Almost surely, 2^66385572 is an apocalyptic number.

It is an amenable number.

66385572 is an abundant number, since it is smaller than the sum of its proper divisors (102596220).

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

66385572 is a wasteful number, since it uses less digits than its factorization.

66385572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502939 (or 502937 counting only the distinct ones).

The product of its digits is 302400, while the sum is 42.

The square root of 66385572 is about 8147.7341635574. The cubic root of 66385572 is about 404.9094386752.

The spelling of 66385572 in words is "sixty-six million, three hundred eighty-five thousand, five hundred seventy-two".