65561001 has 32 divisors (see below), whose sum is σ = 103649280. Its totient is φ = 36417600.

The previous prime is 65560997. The next prime is 65561011. The reversal of 65561001 is 10016556.

65561001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 65561001 - 2² = 65560997 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65561011) 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 31 ways as a sum of consecutive naturals, for example, 17751 + ... + 21123.

It is an arithmetic number, because the mean of its divisors is an integer number (3239040).

Almost surely, 2^65561001 is an apocalyptic number.

It is an amenable number.

65561001 is a deficient number, since it is larger than the sum of its proper divisors (38088279).

65561001 is a wasteful number, since it uses less digits than its factorization.

65561001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3437.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 65561001 is about 8096.9748054443. The cubic root of 65561001 is about 403.2259978178.

Adding to 65561001 its reverse (10016556), we get a palindrome (75577557).

It can be divided in two parts, 6556 and 1001, that added together give a palindrome (7557).

The spelling of 65561001 in words is "sixty-five million, five hundred sixty-one thousand, one".