66226697 has 2 divisors, whose sum is σ = 66226698. Its totient is φ = 66226696.

The previous prime is 66226651. The next prime is 66226703. The reversal of 66226697 is 79662266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54523456 + 11703241 = 7384^2 + 3421^2 .

It is a cyclic number.

It is not a de Polignac number, because 66226697 - 2¹² = 66222601 is a prime.

It is not a weakly prime, because it can be changed into another prime (66222697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33113348 + 33113349.

It is an arithmetic number, because the mean of its divisors is an integer number (33113349).

Almost surely, 2^66226697 is an apocalyptic number.

It is an amenable number.

66226697 is a deficient number, since it is larger than the sum of its proper divisors (1).

66226697 is an equidigital number, since it uses as much as digits as its factorization.

66226697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 44.

The square root of 66226697 is about 8137.9786802375. The cubic root of 66226697 is about 404.5861687639.

The spelling of 66226697 in words is "sixty-six million, two hundred twenty-six thousand, six hundred ninety-seven".