66205597 has 2 divisors, whose sum is σ = 66205598. Its totient is φ = 66205596.

The previous prime is 66205591. The next prime is 66205603. The reversal of 66205597 is 79550266.

It is a balanced prime because it is at equal distance from previous prime (66205591) and next prime (66205603).

It can be written as a sum of positive squares in only one way, i.e., 60000516 + 6205081 = 7746^2 + 2491^2 .

It is a cyclic number.

It is not a de Polignac number, because 66205597 - 2²³ = 57816989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66205591) 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, 33102798 + 33102799.

It is an arithmetic number, because the mean of its divisors is an integer number (33102799).

Almost surely, 2^66205597 is an apocalyptic number.

It is an amenable number.

66205597 is a deficient number, since it is larger than the sum of its proper divisors (1).

66205597 is an equidigital number, since it uses as much as digits as its factorization.

66205597 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 113400, while the sum is 40.

The square root of 66205597 is about 8136.6821862477. The cubic root of 66205597 is about 404.5431967937.

The spelling of 66205597 in words is "sixty-six million, two hundred five thousand, five hundred ninety-seven".