65540556 has 24 divisors (see below), whose sum is σ = 169920240. Its totient is φ = 21846816.

The previous prime is 65540543. The next prime is 65540561. The reversal of 65540556 is 65504556.

It is a happy number.

65540556 is a `hidden beast` number, since 65 + 5 + 40 + 556 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 65540556.

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, 303321 + ... + 303536.

It is an arithmetic number, because the mean of its divisors is an integer number (7080010).

Almost surely, 2^65540556 is an apocalyptic number.

It is an amenable number.

65540556 is an abundant number, since it is smaller than the sum of its proper divisors (104379684).

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

65540556 is a wasteful number, since it uses less digits than its factorization.

65540556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606870 (or 606862 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 36.

The square root of 65540556 is about 8095.7121984418. The cubic root of 65540556 is about 403.1840785238.

The spelling of 65540556 in words is "sixty-five million, five hundred forty thousand, five hundred fifty-six".