65489561 has 4 divisors (see below), whose sum is σ = 68936400. Its totient is φ = 62042724.

The previous prime is 65489531. The next prime is 65489603. The reversal of 65489561 is 16598456.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 65489561 - 2¹⁰ = 65488537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65489521) 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, 1723391 + ... + 1723428.

It is an arithmetic number, because the mean of its divisors is an integer number (17234100).

Almost surely, 2^65489561 is an apocalyptic number.

It is an amenable number.

65489561 is a deficient number, since it is larger than the sum of its proper divisors (3446839).

65489561 is a wasteful number, since it uses less digits than its factorization.

65489561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3446838.

The product of its digits is 259200, while the sum is 44.

The square root of 65489561 is about 8092.5620788475. The cubic root of 65489561 is about 403.0794832009.

The spelling of 65489561 in words is "sixty-five million, four hundred eighty-nine thousand, five hundred sixty-one".