65221837 has 2 divisors, whose sum is σ = 65221838. Its totient is φ = 65221836.

The previous prime is 65221831. The next prime is 65221873. The reversal of 65221837 is 73812256.

It is a happy number.

Together with next prime (65221873) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55071241 + 10150596 = 7421^2 + 3186^2 .

It is a cyclic number.

It is not a de Polignac number, because 65221837 - 2³ = 65221829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65221831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32610918 + 32610919.

It is an arithmetic number, because the mean of its divisors is an integer number (32610919).

Almost surely, 2^65221837 is an apocalyptic number.

It is an amenable number.

65221837 is a deficient number, since it is larger than the sum of its proper divisors (1).

65221837 is an equidigital number, since it uses as much as digits as its factorization.

65221837 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 34.

The square root of 65221837 is about 8076.0037766212. The cubic root of 65221837 is about 402.5294645560.

The spelling of 65221837 in words is "sixty-five million, two hundred twenty-one thousand, eight hundred thirty-seven".