630673661 has 2 divisors, whose sum is σ = 630673662. Its totient is φ = 630673660.

The previous prime is 630673651. The next prime is 630673709. The reversal of 630673661 is 166376036.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 545923225 + 84750436 = 23365^2 + 9206^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-630673661 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (630673601) 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, 315336830 + 315336831.

It is an arithmetic number, because the mean of its divisors is an integer number (315336831).

Almost surely, 2^630673661 is an apocalyptic number.

It is an amenable number.

630673661 is a deficient number, since it is larger than the sum of its proper divisors (1).

630673661 is an equidigital number, since it uses as much as digits as its factorization.

630673661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 38.

The square root of 630673661 is about 25113.2168588574. The cubic root of 630673661 is about 857.5673370043.

The spelling of 630673661 in words is "six hundred thirty million, six hundred seventy-three thousand, six hundred sixty-one".