660555023 has 2 divisors, whose sum is σ = 660555024. Its totient is φ = 660555022.

The previous prime is 660555019. The next prime is 660555029. The reversal of 660555023 is 320555066.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 660555023 - 2² = 660555019 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660555029) 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, 330277511 + 330277512.

It is an arithmetic number, because the mean of its divisors is an integer number (330277512).

Almost surely, 2^660555023 is an apocalyptic number.

660555023 is a deficient number, since it is larger than the sum of its proper divisors (1).

660555023 is an equidigital number, since it uses as much as digits as its factorization.

660555023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27000, while the sum is 32.

The square root of 660555023 is about 25701.2650077773. The cubic root of 660555023 is about 870.9027591412.

The spelling of 660555023 in words is "six hundred sixty million, five hundred fifty-five thousand, twenty-three".