61660 has 12 divisors (see below), whose sum is σ = 129528. Its totient is φ = 24656.

The previous prime is 61657. The next prime is 61667. The reversal of 61660 is 6616.

It is a happy number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 1522 + ... + 1561.

It is an arithmetic number, because the mean of its divisors is an integer number (10794).

2⁶¹⁶⁶⁰ is an apocalyptic number.

It is an amenable number.

61660 is an abundant number, since it is smaller than the sum of its proper divisors (67868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64764).

61660 is a wasteful number, since it uses less digits than its factorization.

61660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3092 (or 3090 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 61660 is about 248.3143169453. The cubic root of 61660 is about 39.5064348861.

It can be divided in two parts, 616 and 60, that added together give a palindrome (676).

The spelling of 61660 in words is "sixty-one thousand, six hundred sixty".