65561200 has 60 divisors (see below), whose sum is σ = 158380488. Its totient is φ = 26080000.

The previous prime is 65561189. The next prime is 65561207. The reversal of 65561200 is 216556.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65561207) 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, 100074 + ... + 100726.

Almost surely, 2^65561200 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65561200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79190244).

65561200 is an abundant number, since it is smaller than the sum of its proper divisors (92819288).

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

65561200 is a wasteful number, since it uses less digits than its factorization.

65561200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922 (or 911 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 65561200 is about 8096.9870939751. The cubic root of 65561200 is about 403.2264057935.

Adding to 65561200 its reverse (216556), we get a palindrome (65777756).

The spelling of 65561200 in words is "sixty-five million, five hundred sixty-one thousand, two hundred".