66446197 has 2 divisors, whose sum is σ = 66446198. Its totient is φ = 66446196.

The previous prime is 66446179. The next prime is 66446207. The reversal of 66446197 is 79164466.

Together with previous prime (66446179) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66438801 + 7396 = 8151^2 + 86^2 .

It is a cyclic number.

It is not a de Polignac number, because 66446197 - 2⁷ = 66446069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66446167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33223098 + 33223099.

It is an arithmetic number, because the mean of its divisors is an integer number (33223099).

Almost surely, 2^66446197 is an apocalyptic number.

It is an amenable number.

66446197 is a deficient number, since it is larger than the sum of its proper divisors (1).

66446197 is an equidigital number, since it uses as much as digits as its factorization.

66446197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 43.

The square root of 66446197 is about 8151.4536740388. The cubic root of 66446197 is about 405.0326590541.

The spelling of 66446197 in words is "sixty-six million, four hundred forty-six thousand, one hundred ninety-seven".