630687919709 has 2 divisors, whose sum is σ = 630687919710. Its totient is φ = 630687919708.

The previous prime is 630687919571. The next prime is 630687919747. The reversal of 630687919709 is 907919786036.

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., 612232697209 + 18455222500 = 782453^2 + 135850^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-630687919709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (630687919789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315343959854 + 315343959855.

It is an arithmetic number, because the mean of its divisors is an integer number (315343959855).

Almost surely, 2^630687919709 is an apocalyptic number.

It is an amenable number.

630687919709 is a deficient number, since it is larger than the sum of its proper divisors (1).

630687919709 is an equidigital number, since it uses as much as digits as its factorization.

630687919709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30862944, while the sum is 65.

The spelling of 630687919709 in words is "six hundred thirty billion, six hundred eighty-seven million, nine hundred nineteen thousand, seven hundred nine".