65561742 has 48 divisors (see below), whose sum is σ = 152390160. Its totient is φ = 20307456.

The previous prime is 65561737. The next prime is 65561759. The reversal of 65561742 is 24716556.

It is a happy number.

65561742 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 65561697 and 65561706.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 16318 + ... + 19934.

It is an arithmetic number, because the mean of its divisors is an integer number (3174795).

Almost surely, 2^65561742 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65561742, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76195080).

65561742 is an abundant number, since it is smaller than the sum of its proper divisors (86828418).

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

65561742 is a wasteful number, since it uses less digits than its factorization.

65561742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3697 (or 3694 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 65561742 is about 8097.0205631454. The cubic root of 65561742 is about 403.2275169594.

The spelling of 65561742 in words is "sixty-five million, five hundred sixty-one thousand, seven hundred forty-two".