65105222221 has 8 divisors (see below), whose sum is σ = 70115953824. Its totient is φ = 60094867440.

The previous prime is 65105222219. The next prime is 65105222257. The reversal of 65105222221 is 12222250156.

65105222221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65105222221 - 2¹ = 65105222219 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65105222221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65105220221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 338166 + ... + 494536.

It is an arithmetic number, because the mean of its divisors is an integer number (8764494228).

Almost surely, 2^65105222221 is an apocalyptic number.

It is an amenable number.

65105222221 is a deficient number, since it is larger than the sum of its proper divisors (5010731603).

65105222221 is a wasteful number, since it uses less digits than its factorization.

65105222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188411.

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 65105222221 its reverse (12222250156), we get a palindrome (77327472377).

The spelling of 65105222221 in words is "sixty-five billion, one hundred five million, two hundred twenty-two thousand, two hundred twenty-one".