65042561 has 8 divisors (see below), whose sum is σ = 69002280. Its totient is φ = 61097728.

The previous prime is 65042533. The next prime is 65042569. The reversal of 65042561 is 16524056.

It can be written as a sum of positive squares in 4 ways, for example, as 78961 + 64963600 = 281^2 + 8060^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-65042561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65042569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6035 + ... + 12903.

It is an arithmetic number, because the mean of its divisors is an integer number (8625285).

Almost surely, 2^65042561 is an apocalyptic number.

It is an amenable number.

65042561 is a deficient number, since it is larger than the sum of its proper divisors (3959719).

65042561 is a wasteful number, since it uses less digits than its factorization.

65042561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7443.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 65042561 is about 8064.8968375299. The cubic root of 65042561 is about 402.1603136909.

The spelling of 65042561 in words is "sixty-five million, forty-two thousand, five hundred sixty-one".