65942726221 has 2 divisors, whose sum is σ = 65942726222. Its totient is φ = 65942726220.

The previous prime is 65942726209. The next prime is 65942726329. The reversal of 65942726221 is 12262724956.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50314976100 + 15627750121 = 224310^2 + 125011^2 .

It is a cyclic number.

It is not a de Polignac number, because 65942726221 - 2¹⁷ = 65942595149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65942726021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32971363110 + 32971363111.

It is an arithmetic number, because the mean of its divisors is an integer number (32971363111).

Almost surely, 2^65942726221 is an apocalyptic number.

It is an amenable number.

65942726221 is a deficient number, since it is larger than the sum of its proper divisors (1).

65942726221 is an equidigital number, since it uses as much as digits as its factorization.

65942726221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 46.

The spelling of 65942726221 in words is "sixty-five billion, nine hundred forty-two million, seven hundred twenty-six thousand, two hundred twenty-one".