65656649 has 2 divisors, whose sum is σ = 65656650. Its totient is φ = 65656648.

The previous prime is 65656637. The next prime is 65656687. The reversal of 65656649 is 94665656.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65496649 + 160000 = 8093^2 + 400^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65656649 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (65656049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32828324 + 32828325.

It is an arithmetic number, because the mean of its divisors is an integer number (32828325).

Almost surely, 2^65656649 is an apocalyptic number.

It is an amenable number.

65656649 is a deficient number, since it is larger than the sum of its proper divisors (1).

65656649 is an equidigital number, since it uses as much as digits as its factorization.

65656649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1166400, while the sum is 47.

The square root of 65656649 is about 8102.8790562367. The cubic root of 65656649 is about 403.4219935019.

The spelling of 65656649 in words is "sixty-five million, six hundred fifty-six thousand, six hundred forty-nine".