66227701 has 2 divisors, whose sum is σ = 66227702. Its totient is φ = 66227700.

The previous prime is 66227671. The next prime is 66227723. The reversal of 66227701 is 10772266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62331025 + 3896676 = 7895^2 + 1974^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66227701 is a prime.

It is a super-2 number, since 2×66227701² = 8772216759490802, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66227731) 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, 33113850 + 33113851.

It is an arithmetic number, because the mean of its divisors is an integer number (33113851).

Almost surely, 2^66227701 is an apocalyptic number.

It is an amenable number.

66227701 is a deficient number, since it is larger than the sum of its proper divisors (1).

66227701 is an equidigital number, since it uses as much as digits as its factorization.

66227701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 66227701 is about 8138.0403660832. The cubic root of 66227701 is about 404.5882132690.

Adding to 66227701 its reverse (10772266), we get a palindrome (76999967).

The spelling of 66227701 in words is "sixty-six million, two hundred twenty-seven thousand, seven hundred one".