51663 has 8 divisors (see below), whose sum is σ = 73008. Its totient is φ = 32384.

The previous prime is 51659. The next prime is 51673. The reversal of 51663 is 36615.

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 51663 - 2² = 51659 is a prime.

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51613) 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, 456 + ... + 557.

It is an arithmetic number, because the mean of its divisors is an integer number (9126).

2⁵¹⁶⁶³ is an apocalyptic number.

51663 is a deficient number, since it is larger than the sum of its proper divisors (21345).

51663 is a wasteful number, since it uses less digits than its factorization.

51663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033.

The product of its digits is 540, while the sum is 21.

The square root of 51663 is about 227.2949625487. The cubic root of 51663 is about 37.2443049414.

The spelling of 51663 in words is "fifty-one thousand, six hundred sixty-three".