645033427 has 2 divisors, whose sum is σ = 645033428. Its totient is φ = 645033426.

The previous prime is 645033419. The next prime is 645033449. The reversal of 645033427 is 724330546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645033427 - 2³ = 645033419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 645033392 and 645033401.

It is not a weakly prime, because it can be changed into another prime (645033407) 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, 322516713 + 322516714.

It is an arithmetic number, because the mean of its divisors is an integer number (322516714).

Almost surely, 2^645033427 is an apocalyptic number.

645033427 is a deficient number, since it is larger than the sum of its proper divisors (1).

645033427 is an equidigital number, since it uses as much as digits as its factorization.

645033427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 34.

The square root of 645033427 is about 25397.5082832942. The cubic root of 645033427 is about 864.0271852693.

The spelling of 645033427 in words is "six hundred forty-five million, thirty-three thousand, four hundred twenty-seven".