65225561 has 4 divisors (see below), whose sum is σ = 66988452. Its totient is φ = 63462672.

The previous prime is 65225551. The next prime is 65225569. The reversal of 65225561 is 16552256.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31990336 + 33235225 = 5656^2 + 5765^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65225561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65225569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 881390 + ... + 881463.

It is an arithmetic number, because the mean of its divisors is an integer number (16747113).

Almost surely, 2^65225561 is an apocalyptic number.

It is an amenable number.

65225561 is a deficient number, since it is larger than the sum of its proper divisors (1762891).

65225561 is a wasteful number, since it uses less digits than its factorization.

65225561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1762890.

The product of its digits is 18000, while the sum is 32.

The square root of 65225561 is about 8076.2343329054. The cubic root of 65225561 is about 402.5371255443.

The spelling of 65225561 in words is "sixty-five million, two hundred twenty-five thousand, five hundred sixty-one".