677433328981 has 2 divisors, whose sum is σ = 677433328982. Its totient is φ = 677433328980.

The previous prime is 677433328973. The next prime is 677433329033. The reversal of 677433328981 is 189823334776.

It is a happy number.

677433328981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 493941896100 + 183491432881 = 702810^2 + 428359^2 .

It is a cyclic number.

It is not a de Polignac number, because 677433328981 - 2³ = 677433328973 is a prime.

It is a super-2 number, since 2×677433328981² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (677433323981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 338716664490 + 338716664491.

It is an arithmetic number, because the mean of its divisors is an integer number (338716664491).

Almost surely, 2^677433328981 is an apocalyptic number.

It is an amenable number.

677433328981 is a deficient number, since it is larger than the sum of its proper divisors (1).

677433328981 is an equidigital number, since it uses as much as digits as its factorization.

677433328981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36578304, while the sum is 61.

The spelling of 677433328981 in words is "six hundred seventy-seven billion, four hundred thirty-three million, three hundred twenty-eight thousand, nine hundred eighty-one".