645545027 has 2 divisors, whose sum is σ = 645545028. Its totient is φ = 645545026.

The previous prime is 645544987. The next prime is 645545039. The reversal of 645545027 is 720545546.

645545027 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645545027 - 2²⁶ = 578436163 is a prime.

It is a Chen prime.

It is equal to p_33573782 and since 645545027 and 33573782 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (645545827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322772513 + 322772514.

It is an arithmetic number, because the mean of its divisors is an integer number (322772514).

Almost surely, 2^645545027 is an apocalyptic number.

645545027 is a deficient number, since it is larger than the sum of its proper divisors (1).

645545027 is an equidigital number, since it uses as much as digits as its factorization.

645545027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168000, while the sum is 38.

The square root of 645545027 is about 25407.5781411767. The cubic root of 645545027 is about 864.2555556017.

The spelling of 645545027 in words is "six hundred forty-five million, five hundred forty-five thousand, twenty-seven".