677650066781 has 2 divisors, whose sum is σ = 677650066782. Its totient is φ = 677650066780.

The previous prime is 677650066747. The next prime is 677650066787. The reversal of 677650066781 is 187660056776.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 652434214756 + 25215852025 = 807734^2 + 158795^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-677650066781 is a prime.

It is a super-2 number, since 2×677650066781² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 677650066781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (677650066787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 338825033390 + 338825033391.

It is an arithmetic number, because the mean of its divisors is an integer number (338825033391).

Almost surely, 2^677650066781 is an apocalyptic number.

It is an amenable number.

677650066781 is a deficient number, since it is larger than the sum of its proper divisors (1).

677650066781 is an equidigital number, since it uses as much as digits as its factorization.

677650066781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17781120, while the sum is 59.

The spelling of 677650066781 in words is "six hundred seventy-seven billion, six hundred fifty million, sixty-six thousand, seven hundred eighty-one".