65609777 has 4 divisors (see below), whose sum is σ = 68462400. Its totient is φ = 62757156.

The previous prime is 65609767. The next prime is 65609779. The reversal of 65609777 is 77790656.

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 not a de Polignac number, because 65609777 - 2²⁰ = 64561201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65609779) 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 3 ways as a sum of consecutive naturals, for example, 1426277 + ... + 1426322.

It is an arithmetic number, because the mean of its divisors is an integer number (17115600).

Almost surely, 2^65609777 is an apocalyptic number.

It is an amenable number.

65609777 is a deficient number, since it is larger than the sum of its proper divisors (2852623).

65609777 is a wasteful number, since it uses less digits than its factorization.

65609777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2852622.

The product of its (nonzero) digits is 555660, while the sum is 47.

The square root of 65609777 is about 8099.9862345562. The cubic root of 65609777 is about 403.3259702380.

The spelling of 65609777 in words is "sixty-five million, six hundred nine thousand, seven hundred seventy-seven".