65999956 has 24 divisors (see below), whose sum is σ = 126614880.
Its totient is φ = 29853600.
The previous prime is 65999951. The next prime is 65999993.
It is a happy number.
65999956 is nontrivially palindromic in base 10.
It is a self number, because there is not a number n which added to its sum of digits gives 65999956.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (65999951) 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, 5730 + ... + 12838.
It is an arithmetic number, because the mean of its divisors is an integer number (5275620).
Almost surely, 265999956 is an apocalyptic number.
It is an amenable number.
65999956 is a deficient number, since it is larger than the sum of its proper divisors (60614924).
65999956 is a wasteful number, since it uses less digits than its factorization.
65999956 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 7335 (or 7333 counting only the distinct ones).
The product of its digits is 5904900, while the sum is 58.
The square root of 65999956 is about 8124.0356966227.
The cubic root of 65999956 is about 404.1239122569.
The spelling of 65999956 in words is "sixty-five million, nine hundred ninety-nine thousand, nine hundred fifty-six".