65681285 has 8 divisors (see below), whose sum is σ = 83453976. Its totient is φ = 49454080.

The previous prime is 65681249. The next prime is 65681293. The reversal of 65681285 is 58218656.

It can be written as a sum of positive squares in 4 ways, for example, as 7219969 + 58461316 = 2687^2 + 7646^2 .

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

It is not a de Polignac number, because 65681285 - 2²⁴ = 48904069 is a prime.

It is a super-3 number, since 3×65681285³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

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, 386276 + ... + 386445.

It is an arithmetic number, because the mean of its divisors is an integer number (10431747).

Almost surely, 2^65681285 is an apocalyptic number.

It is an amenable number.

65681285 is a deficient number, since it is larger than the sum of its proper divisors (17772691).

65681285 is a wasteful number, since it uses less digits than its factorization.

65681285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772743.

The product of its digits is 115200, while the sum is 41.

The square root of 65681285 is about 8104.3991140614. The cubic root of 65681285 is about 403.4724451650.

The spelling of 65681285 in words is "sixty-five million, six hundred eighty-one thousand, two hundred eighty-five".