65642665689 has 24 divisors (see below), whose sum is σ = 98953051392. Its totient is φ = 41853430080.

The previous prime is 65642665651. The next prime is 65642665763. The reversal of 65642665689 is 98656624656.

65642665689 is a `hidden beast` number, since 6 + 5 + 6 + 4 + 2 + 66 + 568 + 9 = 666.

It is not a de Polignac number, because 65642665689 - 2³¹ = 63495182041 is a prime.

It is a super-3 number, since 3×65642665689³ (a number of 33 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (65642665619) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1949184 + ... + 1982574.

It is an arithmetic number, because the mean of its divisors is an integer number (4123043808).

Almost surely, 2^65642665689 is an apocalyptic number.

65642665689 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

It is an amenable number.

65642665689 is a deficient number, since it is larger than the sum of its proper divisors (33310385703).

65642665689 is a wasteful number, since it uses less digits than its factorization.

65642665689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42917 (or 42914 counting only the distinct ones).

The product of its digits is 111974400, while the sum is 63.

The spelling of 65642665689 in words is "sixty-five billion, six hundred forty-two million, six hundred sixty-five thousand, six hundred eighty-nine".