66227989 has 2 divisors, whose sum is σ = 66227990. Its totient is φ = 66227988.

The previous prime is 66227969. The next prime is 66228037. The reversal of 66227989 is 98972266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38031889 + 28196100 = 6167^2 + 5310^2 .

It is a cyclic number.

It is not a de Polignac number, because 66227989 - 2²¹ = 64130837 is a prime.

It is a super-2 number, since 2×66227989² = 8772293053968242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66227969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33113994 + 33113995.

It is an arithmetic number, because the mean of its divisors is an integer number (33113995).

Almost surely, 2^66227989 is an apocalyptic number.

It is an amenable number.

66227989 is a deficient number, since it is larger than the sum of its proper divisors (1).

66227989 is an equidigital number, since it uses as much as digits as its factorization.

66227989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 49.

The square root of 66227989 is about 8138.0580607415. The cubic root of 66227989 is about 404.5887997367.

The spelling of 66227989 in words is "sixty-six million, two hundred twenty-seven thousand, nine hundred eighty-nine".