65560661 has 4 divisors (see below), whose sum is σ = 65608032. Its totient is φ = 65513292.

The previous prime is 65560657. The next prime is 65560673. The reversal of 65560661 is 16606556.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 65560661 - 2² = 65560657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65560861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21545 + ... + 24398.

It is an arithmetic number, because the mean of its divisors is an integer number (16402008).

Almost surely, 2^65560661 is an apocalyptic number.

It is an amenable number.

65560661 is a deficient number, since it is larger than the sum of its proper divisors (47371).

65560661 is a wasteful number, since it uses less digits than its factorization.

65560661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47370.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 65560661 is about 8096.9538099214. The cubic root of 65560661 is about 403.2253007719.

It can be divided in two parts, 655 and 60661, that added together give a palindrome (61316).

The spelling of 65560661 in words is "sixty-five million, five hundred sixty thousand, six hundred sixty-one".