61665 has 8 divisors (see below), whose sum is σ = 98688. Its totient is φ = 32880.

The previous prime is 61657. The next prime is 61667. The reversal of 61665 is 56616.

61665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 61665 - 2³ = 61657 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 61665.

It is not an unprimeable number, because it can be changed into a prime (61667) 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, 2041 + ... + 2070.

It is an arithmetic number, because the mean of its divisors is an integer number (12336).

2⁶¹⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

61665 is a deficient number, since it is larger than the sum of its proper divisors (37023).

61665 is a wasteful number, since it uses less digits than its factorization.

61665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4119.

The product of its digits is 1080, while the sum is 24.

The square root of 61665 is about 248.3243846262. The cubic root of 61665 is about 39.5075027141.

The spelling of 61665 in words is "sixty-one thousand, six hundred sixty-five".