65665165667 has 4 divisors (see below), whose sum is σ = 66005399880. Its totient is φ = 65324931456.

The previous prime is 65665165649. The next prime is 65665165673. The reversal of 65665165667 is 76656156656.

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

It is a cyclic number.

It is not a de Polignac number, because 65665165667 - 2³⁰ = 64591423843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65665165627) 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, 170116817 + ... + 170117202.

It is an arithmetic number, because the mean of its divisors is an integer number (16501349970).

Almost surely, 2^65665165667 is an apocalyptic number.

65665165667 is a deficient number, since it is larger than the sum of its proper divisors (340234213).

65665165667 is a wasteful number, since it uses less digits than its factorization.

65665165667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340234212.

The product of its digits is 40824000, while the sum is 59.

The spelling of 65665165667 in words is "sixty-five billion, six hundred sixty-five million, one hundred sixty-five thousand, six hundred sixty-seven".