65461561 has 4 divisors (see below), whose sum is σ = 71412624. Its totient is φ = 59510500.

The previous prime is 65461531. The next prime is 65461597. The reversal of 65461561 is 16516456.

It is a happy number.

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 65461561 - 2⁹ = 65461049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65461531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2975515 + ... + 2975536.

It is an arithmetic number, because the mean of its divisors is an integer number (17853156).

Almost surely, 2^65461561 is an apocalyptic number.

It is an amenable number.

65461561 is a deficient number, since it is larger than the sum of its proper divisors (5951063).

65461561 is a wasteful number, since it uses less digits than its factorization.

65461561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5951062.

The product of its digits is 21600, while the sum is 34.

The square root of 65461561 is about 8090.8319102550. The cubic root of 65461561 is about 403.0220295945.

The spelling of 65461561 in words is "sixty-five million, four hundred sixty-one thousand, five hundred sixty-one".