65500017909 has 4 divisors (see below), whose sum is σ = 87333357216. Its totient is φ = 43666678604.

The previous prime is 65500017907. The next prime is 65500017911. The reversal of 65500017909 is 90971000556.

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 an interprime number because it is at equal distance from previous prime (65500017907) and next prime (65500017911).

It is a cyclic number.

It is not a de Polignac number, because 65500017909 - 2¹ = 65500017907 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65500017907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10916669649 + ... + 10916669654.

It is an arithmetic number, because the mean of its divisors is an integer number (21833339304).

Almost surely, 2^65500017909 is an apocalyptic number.

It is an amenable number.

65500017909 is a deficient number, since it is larger than the sum of its proper divisors (21833339307).

65500017909 is a wasteful number, since it uses less digits than its factorization.

65500017909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21833339306.

The product of its (nonzero) digits is 85050, while the sum is 42.

The spelling of 65500017909 in words is "sixty-five billion, five hundred million, seventeen thousand, nine hundred nine".