65506668329 has 4 divisors (see below), whose sum is σ = 65541348180. Its totient is φ = 65471988480.

The previous prime is 65506668319. The next prime is 65506668343. The reversal of 65506668329 is 92386660556.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49033459225 + 16473209104 = 221435^2 + 128348^2 .

It is a cyclic number.

It is not a de Polignac number, because 65506668329 - 2²⁴ = 65489891113 is a prime.

It is a super-2 number, since 2×65506668329² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65506668319) 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, 17337092 + ... + 17340869.

It is an arithmetic number, because the mean of its divisors is an integer number (16385337045).

Almost surely, 2^65506668329 is an apocalyptic number.

It is an amenable number.

65506668329 is a deficient number, since it is larger than the sum of its proper divisors (34679851).

65506668329 is a wasteful number, since it uses less digits than its factorization.

65506668329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34679850.

The product of its (nonzero) digits is 13996800, while the sum is 56.

The spelling of 65506668329 in words is "sixty-five billion, five hundred six million, six hundred sixty-eight thousand, three hundred twenty-nine".