65898940665 has 8 divisors (see below), whose sum is σ = 105438305088. Its totient is φ = 35146101680.

The previous prime is 65898940637. The next prime is 65898940673. The reversal of 65898940665 is 56604989856.

It is a happy number.

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

It is not a de Polignac number, because 65898940665 - 2¹⁵ = 65898907897 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 65898940596 and 65898940605.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2196631341 + ... + 2196631370.

It is an arithmetic number, because the mean of its divisors is an integer number (13179788136).

Almost surely, 2^65898940665 is an apocalyptic number.

It is an amenable number.

65898940665 is a deficient number, since it is larger than the sum of its proper divisors (39539364423).

65898940665 is a wasteful number, since it uses less digits than its factorization.

65898940665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4393262719.

The product of its (nonzero) digits is 111974400, while the sum is 66.

The spelling of 65898940665 in words is "sixty-five billion, eight hundred ninety-eight million, nine hundred forty thousand, six hundred sixty-five".