66433397 has 2 divisors, whose sum is σ = 66433398. Its totient is φ = 66433396.

The previous prime is 66433387. The next prime is 66433447. The reversal of 66433397 is 79333466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66161956 + 271441 = 8134^2 + 521^2 .

It is a cyclic number.

It is not a de Polignac number, because 66433397 - 2²⁴ = 49656181 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66433307) 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, 33216698 + 33216699.

It is an arithmetic number, because the mean of its divisors is an integer number (33216699).

Almost surely, 2^66433397 is an apocalyptic number.

It is an amenable number.

66433397 is a deficient number, since it is larger than the sum of its proper divisors (1).

66433397 is an equidigital number, since it uses as much as digits as its factorization.

66433397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 41.

The square root of 66433397 is about 8150.6685001906. The cubic root of 66433397 is about 405.0066492837.

The spelling of 66433397 in words is "sixty-six million, four hundred thirty-three thousand, three hundred ninety-seven".