645566163023 has 2 divisors, whose sum is σ = 645566163024. Its totient is φ = 645566163022.

The previous prime is 645566163013. The next prime is 645566163029. The reversal of 645566163023 is 320361665546.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645566163023 - 2⁸ = 645566162767 is a prime.

It is a super-3 number, since 3×645566163023³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645566163029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322783081511 + 322783081512.

It is an arithmetic number, because the mean of its divisors is an integer number (322783081512).

Almost surely, 2^645566163023 is an apocalyptic number.

645566163023 is a deficient number, since it is larger than the sum of its proper divisors (1).

645566163023 is an equidigital number, since it uses as much as digits as its factorization.

645566163023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2332800, while the sum is 47.

The spelling of 645566163023 in words is "six hundred forty-five billion, five hundred sixty-six million, one hundred sixty-three thousand, twenty-three".