65885689 has 3 divisors (see below), whose sum is σ = 65893807.
Its totient is φ = 65877572.
The previous prime is 65885669. The next prime is 65885707. The reversal of 65885689 is 98658856.
The square root of 65885689 is 8117.
It is a perfect power (a square), and thus also a powerful number.
It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.
It can be written as a sum of positive squares in only one way, i.e., 59675625 + 6210064 = 7725^2 + 2492^2
It is not a de Polignac number, because 65885689 - 221 = 63788537 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (65885669) by changing a digit.
It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4059 + ... + 12175.
Almost surely, 265885689 is an apocalyptic number.
65885689 is the 8117-th square number.
65885689 is the 4059-th centered octagonal number.
It is an amenable number.
65885689 is a deficient number, since it is larger than the sum of its proper divisors (8118).
65885689 is an frugal number, since it uses more digits than its factorization.
65885689 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 16234 (or 8117 counting only the distinct ones).
The product of its digits is 4147200, while the sum is 55.
The cubic root of 65885689 is about 403.8905550186.
The spelling of 65885689 in words is "sixty-five million, eight hundred eighty-five thousand, six hundred eighty-nine".