628943415509 has 2 divisors, whose sum is σ = 628943415510. Its totient is φ = 628943415508.

The previous prime is 628943415479. The next prime is 628943415533. The reversal of 628943415509 is 905514349826.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 613837776484 + 15105639025 = 783478^2 + 122905^2 .

It is a cyclic number.

It is not a de Polignac number, because 628943415509 - 2⁸ = 628943415253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (628943414509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314471707754 + 314471707755.

It is an arithmetic number, because the mean of its divisors is an integer number (314471707755).

Almost surely, 2^628943415509 is an apocalyptic number.

It is an amenable number.

628943415509 is a deficient number, since it is larger than the sum of its proper divisors (1).

628943415509 is an equidigital number, since it uses as much as digits as its factorization.

628943415509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9331200, while the sum is 56.

The spelling of 628943415509 in words is "six hundred twenty-eight billion, nine hundred forty-three million, four hundred fifteen thousand, five hundred nine".