66440597 has 2 divisors, whose sum is σ = 66440598. Its totient is φ = 66440596.

The previous prime is 66440551. The next prime is 66440609. The reversal of 66440597 is 79504466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55741156 + 10699441 = 7466^2 + 3271^2 .

It is a cyclic number.

It is not a de Polignac number, because 66440597 - 2¹² = 66436501 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 (66440797) 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, 33220298 + 33220299.

It is an arithmetic number, because the mean of its divisors is an integer number (33220299).

Almost surely, 2^66440597 is an apocalyptic number.

It is an amenable number.

66440597 is a deficient number, since it is larger than the sum of its proper divisors (1).

66440597 is an equidigital number, since it uses as much as digits as its factorization.

66440597 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 66440597 is about 8151.1101697867. The cubic root of 66440597 is about 405.0212801906.

The spelling of 66440597 in words is "sixty-six million, four hundred forty thousand, five hundred ninety-seven".