51668 has 6 divisors (see below), whose sum is σ = 90426. Its totient is φ = 25832.
The previous prime is 51659. The next prime is 51673. The reversal of 51668 is 86615.
51668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It can be written as a sum of positive squares in only one way, i.e., 44944 + 6724 = 212^2 + 82^2 .
It is a plaindrome in base 9.
It is a congruent number.
It is an unprimeable number.
51668 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6455 + ... + 6462.
It is an arithmetic number, because the mean of its divisors is an integer number (15071).
251668 is an apocalyptic number.
51668 is the 122-nd centered heptagonal number.
It is an amenable number.
51668 is a deficient number, since it is larger than the sum of its proper divisors (38758).
51668 is a wasteful number, since it uses less digits than its factorization.
51668 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 12921 (or 12919 counting only the distinct ones).
The product of its digits is 1440, while the sum is 26.
The square root of 51668 is about 227.3059612065. The cubic root of 51668 is about 37.2455064171.
It can be divided in two parts, 5166 and 8, that multiplied together give a triangular number (41328 = T287).
The spelling of 51668 in words is "fifty-one thousand, six hundred sixty-eight".
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