65605121 has 4 divisors (see below), whose sum is σ = 66039744. Its totient is φ = 65170500.

The previous prime is 65605117. The next prime is 65605123. The reversal of 65605121 is 12150656.

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 65605121 - 2² = 65605117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65605123) 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 3 ways as a sum of consecutive naturals, for example, 217085 + ... + 217386.

It is an arithmetic number, because the mean of its divisors is an integer number (16509936).

Almost surely, 2^65605121 is an apocalyptic number.

It is an amenable number.

65605121 is a deficient number, since it is larger than the sum of its proper divisors (434623).

65605121 is a wasteful number, since it uses less digits than its factorization.

65605121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434622.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 65605121 is about 8099.6988215612. The cubic root of 65605121 is about 403.3164293320.

Adding to 65605121 its reverse (12150656), we get a palindrome (77755777).

The spelling of 65605121 in words is "sixty-five million, six hundred five thousand, one hundred twenty-one".