1630720673 has 2 divisors, whose sum is σ = 1630720674. Its totient is φ = 1630720672.

The previous prime is 1630720643. The next prime is 1630720681. The reversal of 1630720673 is 3760270361.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1159266304 + 471454369 = 34048^2 + 21713^2 .

It is a cyclic number.

It is not a de Polignac number, because 1630720673 - 2²⁶ = 1563611809 is a prime.

It is not a weakly prime, because it can be changed into another prime (1630720643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815360336 + 815360337.

It is an arithmetic number, because the mean of its divisors is an integer number (815360337).

Almost surely, 2^1630720673 is an apocalyptic number.

It is an amenable number.

1630720673 is a deficient number, since it is larger than the sum of its proper divisors (1).

1630720673 is an equidigital number, since it uses as much as digits as its factorization.

1630720673 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31752, while the sum is 35.

The square root of 1630720673 is about 40382.1826180805. The cubic root of 1630720673 is about 1177.0453400699.

The spelling of 1630720673 in words is "one billion, six hundred thirty million, seven hundred twenty thousand, six hundred seventy-three".