55643 has 4 divisors (see below), whose sum is σ = 63600. Its totient is φ = 47688.

The previous prime is 55639. The next prime is 55661. The reversal of 55643 is 34655.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55643 - 2² = 55639 is a prime.

It is a super-2 number, since 2×55643² = 6192286898, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3968 + ... + 3981.

It is an arithmetic number, because the mean of its divisors is an integer number (15900).

2⁵⁵⁶⁴³ is an apocalyptic number.

55643 is a deficient number, since it is larger than the sum of its proper divisors (7957).

55643 is an equidigital number, since it uses as much as digits as its factorization.

55643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7956.

The product of its digits is 1800, while the sum is 23.

The square root of 55643 is about 235.8876851385. The cubic root of 55643 is about 38.1771507041.

The spelling of 55643 in words is "fifty-five thousand, six hundred forty-three".