61866 has 24 divisors (see below), whose sum is σ = 153504. Its totient is φ = 17640.
The previous prime is 61861. The next prime is 61871. The reversal of 61866 is 66816.
It is an interprime number because it is at equal distance from previous prime (61861) and next prime (61871).
It is a Curzon number.
It is not an unprimeable number, because it can be changed into a prime (61861) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 120 + ... + 371.
It is an arithmetic number, because the mean of its divisors is an integer number (6396).
261866 is an apocalyptic number.
61866 is an abundant number, since it is smaller than the sum of its proper divisors (91638).
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 (76752).
61866 is a wasteful number, since it uses less digits than its factorization.
61866 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 506 (or 503 counting only the distinct ones).
The product of its digits is 1728, while the sum is 27.
The square root of 61866 is about 248.7287679381. The cubic root of 61866 is about 39.5503816871.
Subtracting 61866 from its reverse (66816), we obtain a triangular number (4950 = T99).
The spelling of 61866 in words is "sixty-one thousand, eight hundred sixty-six".
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