65577689 has 2 divisors, whose sum is σ = 65577690. Its totient is φ = 65577688.

The previous prime is 65577661. The next prime is 65577691. The reversal of 65577689 is 98677556.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56625625 + 8952064 = 7525^2 + 2992^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65577689 is a prime.

Together with 65577691, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65577689.

It is not a weakly prime, because it can be changed into another prime (65577649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32788844 + 32788845.

It is an arithmetic number, because the mean of its divisors is an integer number (32788845).

Almost surely, 2^65577689 is an apocalyptic number.

It is an amenable number.

65577689 is a deficient number, since it is larger than the sum of its proper divisors (1).

65577689 is an equidigital number, since it uses as much as digits as its factorization.

65577689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3175200, while the sum is 53.

The square root of 65577689 is about 8098.0052482077. The cubic root of 65577689 is about 403.2602075079.

It can be divided in two parts, 65577 and 689, that added together give a palindrome (66266).

The spelling of 65577689 in words is "sixty-five million, five hundred seventy-seven thousand, six hundred eighty-nine".