65722061 has 2 divisors, whose sum is σ = 65722062. Its totient is φ = 65722060.

The previous prime is 65722049. The next prime is 65722079. The reversal of 65722061 is 16022756.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58049161 + 7672900 = 7619^2 + 2770^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65722061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65722001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32861030 + 32861031.

It is an arithmetic number, because the mean of its divisors is an integer number (32861031).

Almost surely, 2^65722061 is an apocalyptic number.

It is an amenable number.

65722061 is a deficient number, since it is larger than the sum of its proper divisors (1).

65722061 is an equidigital number, since it uses as much as digits as its factorization.

65722061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 65722061 is about 8106.9143945153. The cubic root of 65722061 is about 403.5559219577. Note that the first 3 decimals are identical.

The spelling of 65722061 in words is "sixty-five million, seven hundred twenty-two thousand, sixty-one".