65557540 has 24 divisors (see below), whose sum is σ = 138297600. Its totient is φ = 26103648.

The previous prime is 65557523. The next prime is 65557549. The reversal of 65557540 is 4575556.

It is a self number, because there is not a number n which added to its sum of digits gives 65557540.

It is not an unprimeable number, because it can be changed into a prime (65557549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2890 + ... + 11809.

It is an arithmetic number, because the mean of its divisors is an integer number (5762400).

Almost surely, 2^65557540 is an apocalyptic number.

It is an amenable number.

65557540 is an abundant number, since it is smaller than the sum of its proper divisors (72740060).

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

65557540 is a wasteful number, since it uses less digits than its factorization.

65557540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14931 (or 14929 counting only the distinct ones).

The product of its (nonzero) digits is 105000, while the sum is 37.

The square root of 65557540 is about 8096.7610808273. The cubic root of 65557540 is about 403.2189021882.

The spelling of 65557540 in words is "sixty-five million, five hundred fifty-seven thousand, five hundred forty".