66520480 has 48 divisors (see below), whose sum is σ = 169248744. Its totient is φ = 24560640.

The previous prime is 66520471. The next prime is 66520499. The reversal of 66520480 is 8402566.

66520480 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 23853456 + 42667024 = 4884^2 + 6532^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13911 + ... + 18070.

Almost surely, 2^66520480 is an apocalyptic number.

It is an amenable number.

66520480 is an abundant number, since it is smaller than the sum of its proper divisors (102728264).

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

66520480 is a wasteful number, since it uses less digits than its factorization.

66520480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32009 (or 32001 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 66520480 is about 8156.0088278520. The cubic root of 66520480 is about 405.1835371954.

The spelling of 66520480 in words is "sixty-six million, five hundred twenty thousand, four hundred eighty".