53661 has 8 divisors (see below), whose sum is σ = 73984. Its totient is φ = 34560.

The previous prime is 53657. The next prime is 53681. The reversal of 53661 is 16635.

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

It is not a de Polignac number, because 53661 - 2² = 53657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53611) 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, 196 + ... + 381.

It is an arithmetic number, because the mean of its divisors is an integer number (9248).

2⁵³⁶⁶¹ is an apocalyptic number.

It is an amenable number.

53661 is a deficient number, since it is larger than the sum of its proper divisors (20323).

53661 is a wasteful number, since it uses less digits than its factorization.

53661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611.

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

The square root of 53661 is about 231.6484405300. The cubic root of 53661 is about 37.7183703598.

The spelling of 53661 in words is "fifty-three thousand, six hundred sixty-one".