628781045777 has 2 divisors, whose sum is σ = 628781045778. Its totient is φ = 628781045776.

The previous prime is 628781045713. The next prime is 628781045813. The reversal of 628781045777 is 777540187826.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 444314231761 + 184466814016 = 666569^2 + 429496^2 .

It is a cyclic number.

It is not a de Polignac number, because 628781045777 - 2⁶ = 628781045713 is a prime.

It is not a weakly prime, because it can be changed into another prime (628781045177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314390522888 + 314390522889.

It is an arithmetic number, because the mean of its divisors is an integer number (314390522889).

Almost surely, 2^628781045777 is an apocalyptic number.

It is an amenable number.

628781045777 is a deficient number, since it is larger than the sum of its proper divisors (1).

628781045777 is an equidigital number, since it uses as much as digits as its factorization.

628781045777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36879360, while the sum is 62.

The spelling of 628781045777 in words is "six hundred twenty-eight billion, seven hundred eighty-one million, forty-five thousand, seven hundred seventy-seven".