65611600 has 60 divisors (see below), whose sum is σ = 160275580. Its totient is φ = 25804800.

The previous prime is 65611589. The next prime is 65611607. The reversal of 65611600 is 611656.

65611600 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 29899024 + 35712576 = 5468^2 + 5976^2 .

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 (65611607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23056 + ... + 25744.

Almost surely, 2^65611600 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 65611600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80137790).

65611600 is an abundant number, since it is smaller than the sum of its proper divisors (94663980).

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

65611600 is a wasteful number, since it uses less digits than its factorization.

65611600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2768 (or 2757 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 65611600 is about 8100.0987648300. The cubic root of 65611600 is about 403.3297057404.

It can be divided in two parts, 6561 and 1600, that multiplied together give a square (10497600 = 3240²).

The spelling of 65611600 in words is "sixty-five million, six hundred eleven thousand, six hundred".