65609961 has 8 divisors (see below), whose sum is σ = 91283520. Its totient is φ = 41838192.

The previous prime is 65609941. The next prime is 65609969. The reversal of 65609961 is 16990656.

65609961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 65609961 - 2⁷ = 65609833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65609969) 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 7 ways as a sum of consecutive naturals, for example, 475366 + ... + 475503.

It is an arithmetic number, because the mean of its divisors is an integer number (11410440).

Almost surely, 2^65609961 is an apocalyptic number.

It is an amenable number.

65609961 is a deficient number, since it is larger than the sum of its proper divisors (25673559).

65609961 is a wasteful number, since it uses less digits than its factorization.

65609961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 950895.

The product of its (nonzero) digits is 87480, while the sum is 42.

The square root of 65609961 is about 8099.9975925922. The cubic root of 65609961 is about 403.3263472748.

The spelling of 65609961 in words is "sixty-five million, six hundred nine thousand, nine hundred sixty-one".