66267997 has 2 divisors, whose sum is σ = 66267998. Its totient is φ = 66267996.

The previous prime is 66267959. The next prime is 66268003. The reversal of 66267997 is 79976266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65512836 + 755161 = 8094^2 + 869^2 .

It is a cyclic number.

It is not a de Polignac number, because 66267997 - 2⁷ = 66267869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66267907) 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, 33133998 + 33133999.

It is an arithmetic number, because the mean of its divisors is an integer number (33133999).

Almost surely, 2^66267997 is an apocalyptic number.

It is an amenable number.

66267997 is a deficient number, since it is larger than the sum of its proper divisors (1).

66267997 is an equidigital number, since it uses as much as digits as its factorization.

66267997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1714608, while the sum is 52.

The square root of 66267997 is about 8140.5157699006. The cubic root of 66267997 is about 404.6702533668.

The spelling of 66267997 in words is "sixty-six million, two hundred sixty-seven thousand, nine hundred ninety-seven".