65681689 has 8 divisors (see below), whose sum is σ = 70273280. Its totient is φ = 61203600.

The previous prime is 65681687. The next prime is 65681711. The reversal of 65681689 is 98618656.

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

It is a cyclic number.

It is not a de Polignac number, because 65681689 - 2¹ = 65681687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65681687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27177 + ... + 29494.

It is an arithmetic number, because the mean of its divisors is an integer number (8784160).

Almost surely, 2^65681689 is an apocalyptic number.

It is an amenable number.

65681689 is a deficient number, since it is larger than the sum of its proper divisors (4591591).

65681689 is a wasteful number, since it uses less digits than its factorization.

65681689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56751.

The product of its digits is 622080, while the sum is 49.

The square root of 65681689 is about 8104.4240387581. The cubic root of 65681689 is about 403.4732724048.

The spelling of 65681689 in words is "sixty-five million, six hundred eighty-one thousand, six hundred eighty-nine".