66554 has 8 divisors (see below), whose sum is σ = 101088. Its totient is φ = 32860.

The previous prime is 66553. The next prime is 66569. The reversal of 66554 is 45566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a plaindrome in base 9 and base 15.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (66553) 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, 59 + ... + 369.

It is an arithmetic number, because the mean of its divisors is an integer number (12636).

66554 is a Friedman number, since it can be written as 65*4^5-6, using all its digits and the basic arithmetic operations.

2⁶⁶⁵⁵⁴ is an apocalyptic number.

66554 is a deficient number, since it is larger than the sum of its proper divisors (34534).

66554 is a wasteful number, since it uses less digits than its factorization.

66554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420.

The product of its digits is 3600, while the sum is 26.

The square root of 66554 is about 257.9806194271. The cubic root of 66554 is about 40.5251583765.

The spelling of 66554 in words is "sixty-six thousand, five hundred fifty-four".