65238661 has 4 divisors (see below), whose sum is σ = 67488300. Its totient is φ = 62989024.

The previous prime is 65238623. The next prime is 65238671. The reversal of 65238661 is 16683256.

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 46662561 + 18576100 = 6831^2 + 4310^2 .

It is a cyclic number.

It is not a de Polignac number, because 65238661 - 2¹⁷ = 65107589 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65238661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65238671) 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, 1124776 + ... + 1124833.

It is an arithmetic number, because the mean of its divisors is an integer number (16872075).

Almost surely, 2^65238661 is an apocalyptic number.

It is an amenable number.

65238661 is a deficient number, since it is larger than the sum of its proper divisors (2249639).

65238661 is a wasteful number, since it uses less digits than its factorization.

65238661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2249638.

The product of its digits is 51840, while the sum is 37.

The square root of 65238661 is about 8077.0453137270. The cubic root of 65238661 is about 402.5640724614.

The spelling of 65238661 in words is "sixty-five million, two hundred thirty-eight thousand, six hundred sixty-one".