65660550 has 48 divisors (see below), whose sum is σ = 164400192. Its totient is φ = 17341600.

The previous prime is 65660549. The next prime is 65660591. The reversal of 65660550 is 5506656.

It is a super-2 number, since 2×65660550² = 8622615652605000, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14005 + ... + 18095.

It is an arithmetic number, because the mean of its divisors is an integer number (3425004).

Almost surely, 2^65660550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65660550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82200096).

65660550 is an abundant number, since it is smaller than the sum of its proper divisors (98739642).

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

65660550 is a wasteful number, since it uses less digits than its factorization.

65660550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4213 (or 4208 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 33.

The square root of 65660550 is about 8103.1197695702. The cubic root of 65660550 is about 403.4299831371.

The spelling of 65660550 in words is "sixty-five million, six hundred sixty thousand, five hundred fifty".