666040597 has 2 divisors, whose sum is σ = 666040598. Its totient is φ = 666040596.

The previous prime is 666040591. The next prime is 666040607. The reversal of 666040597 is 795040666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 487791396 + 178249201 = 22086^2 + 13351^2 .

It is a cyclic number.

It is not a de Polignac number, because 666040597 - 2¹⁹ = 665516309 is a prime.

It is a super-2 number, since 2×666040597² = 887220153704232818, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666040591) 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, 333020298 + 333020299.

It is an arithmetic number, because the mean of its divisors is an integer number (333020299).

Almost surely, 2^666040597 is an apocalyptic number.

It is an amenable number.

666040597 is a deficient number, since it is larger than the sum of its proper divisors (1).

666040597 is an equidigital number, since it uses as much as digits as its factorization.

666040597 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 43.

The square root of 666040597 is about 25807.7623400403. The cubic root of 666040597 is about 873.3069179736.

The spelling of 666040597 in words is "six hundred sixty-six million, forty thousand, five hundred ninety-seven".