65700221 has 2 divisors, whose sum is σ = 65700222. Its totient is φ = 65700220.

The previous prime is 65700181. The next prime is 65700263. The reversal of 65700221 is 12200756.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59892121 + 5808100 = 7739^2 + 2410^2 .

It is a cyclic number.

It is not a de Polignac number, because 65700221 - 2¹⁸ = 65438077 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65708221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32850110 + 32850111.

It is an arithmetic number, because the mean of its divisors is an integer number (32850111).

Almost surely, 2^65700221 is an apocalyptic number.

It is an amenable number.

65700221 is a deficient number, since it is larger than the sum of its proper divisors (1).

65700221 is an equidigital number, since it uses as much as digits as its factorization.

65700221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 65700221 is about 8105.5672842806. The cubic root of 65700221 is about 403.5112153165.

Adding to 65700221 its reverse (12200756), we get a palindrome (77900977).

The spelling of 65700221 in words is "sixty-five million, seven hundred thousand, two hundred twenty-one".