65644253 has 4 divisors (see below), whose sum is σ = 67418460. Its totient is φ = 63870048.

The previous prime is 65644223. The next prime is 65644283. The reversal of 65644253 is 35244656.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (65644223) and next prime (65644283).

It can be written as a sum of positive squares in 2 ways, for example, as 58951684 + 6692569 = 7678^2 + 2587^2 .

It is a cyclic number.

It is not a de Polignac number, because 65644253 - 2¹⁰ = 65643229 is a prime.

It is a super-3 number, since 3×65644253³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65644223) 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, 887048 + ... + 887121.

It is an arithmetic number, because the mean of its divisors is an integer number (16854615).

Almost surely, 2^65644253 is an apocalyptic number.

It is an amenable number.

65644253 is a deficient number, since it is larger than the sum of its proper divisors (1774207).

65644253 is a wasteful number, since it uses less digits than its factorization.

65644253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1774206.

The product of its digits is 86400, while the sum is 35.

The square root of 65644253 is about 8102.1141068242. The cubic root of 65644253 is about 403.3966031626.

The spelling of 65644253 in words is "sixty-five million, six hundred forty-four thousand, two hundred fifty-three".