66504520 has 32 divisors (see below), whose sum is σ = 150117120. Its totient is φ = 26516160.

The previous prime is 66504499. The next prime is 66504521. The reversal of 66504520 is 2540566.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (66504521) 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, 10729 + ... + 15751.

It is an arithmetic number, because the mean of its divisors is an integer number (4691160).

Almost surely, 2^66504520 is an apocalyptic number.

It is an amenable number.

66504520 is an abundant number, since it is smaller than the sum of its proper divisors (83612600).

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

66504520 is a wasteful number, since it uses less digits than its factorization.

66504520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5365 (or 5361 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 66504520 is about 8155.0303494224. The cubic root of 66504520 is about 405.1511299002.

The spelling of 66504520 in words is "sixty-six million, five hundred four thousand, five hundred twenty".