65638241 has 4 divisors (see below), whose sum is σ = 69499332. Its totient is φ = 61777152.

The previous prime is 65638231. The next prime is 65638247. The reversal of 65638241 is 14283656.

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

It can be written as a sum of positive squares in 2 ways, for example, as 49000000 + 16638241 = 7000^2 + 4079^2 .

It is a cyclic number.

It is not a de Polignac number, because 65638241 - 2¹⁰ = 65637217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65638247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1930520 + ... + 1930553.

It is an arithmetic number, because the mean of its divisors is an integer number (17374833).

Almost surely, 2^65638241 is an apocalyptic number.

It is an amenable number.

65638241 is a deficient number, since it is larger than the sum of its proper divisors (3861091).

65638241 is a wasteful number, since it uses less digits than its factorization.

65638241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3861090.

The product of its digits is 34560, while the sum is 35.

The square root of 65638241 is about 8101.7430840530. The cubic root of 65638241 is about 403.3842878198.

The spelling of 65638241 in words is "sixty-five million, six hundred thirty-eight thousand, two hundred forty-one".