645066629 has 2 divisors, whose sum is σ = 645066630. Its totient is φ = 645066628.

The previous prime is 645066623. The next prime is 645066661. The reversal of 645066629 is 926660546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 594628225 + 50438404 = 24385^2 + 7102^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645066629 is a prime.

It is a super-2 number, since 2×645066629² = 832221911698847282, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 645066629.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645066623) 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, 322533314 + 322533315.

It is an arithmetic number, because the mean of its divisors is an integer number (322533315).

Almost surely, 2^645066629 is an apocalyptic number.

It is an amenable number.

645066629 is a deficient number, since it is larger than the sum of its proper divisors (1).

645066629 is an equidigital number, since it uses as much as digits as its factorization.

645066629 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 466560, while the sum is 44.

The square root of 645066629 is about 25398.1619216824. The cubic root of 645066629 is about 864.0420097922.

The spelling of 645066629 in words is "six hundred forty-five million, sixty-six thousand, six hundred twenty-nine".