66560540 has 24 divisors (see below), whose sum is σ = 139972560. Its totient is φ = 26587008.

The previous prime is 66560537. The next prime is 66560569. The reversal of 66560540 is 4506566.

It is a junction number, because it is equal to n+sod(n) for n = 66560497 and 66560506.

It is a congruent 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, 15776 + ... + 19544.

It is an arithmetic number, because the mean of its divisors is an integer number (5832190).

Almost surely, 2^66560540 is an apocalyptic number.

It is an amenable number.

66560540 is an abundant number, since it is smaller than the sum of its proper divisors (73412020).

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

66560540 is a wasteful number, since it uses less digits than its factorization.

66560540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4661 (or 4659 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 66560540 is about 8158.4643162791. The cubic root of 66560540 is about 405.2648574908.

The spelling of 66560540 in words is "sixty-six million, five hundred sixty thousand, five hundred forty".