668887560977 has 2 divisors, whose sum is σ = 668887560978. Its totient is φ = 668887560976.

The previous prime is 668887560953. The next prime is 668887561021. The reversal of 668887560977 is 779065788866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 534074486416 + 134813074561 = 730804^2 + 367169^2 .

It is a cyclic number.

It is not a de Polignac number, because 668887560977 - 2²⁴ = 668870783761 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 668887560898 and 668887560907.

It is not a weakly prime, because it can be changed into another prime (668887560907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334443780488 + 334443780489.

It is an arithmetic number, because the mean of its divisors is an integer number (334443780489).

Almost surely, 2^668887560977 is an apocalyptic number.

It is an amenable number.

668887560977 is a deficient number, since it is larger than the sum of its proper divisors (1).

668887560977 is an equidigital number, since it uses as much as digits as its factorization.

668887560977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1706987520, while the sum is 77.

The spelling of 668887560977 in words is "six hundred sixty-eight billion, eight hundred eighty-seven million, five hundred sixty thousand, nine hundred seventy-seven".