668826905077 has 2 divisors, whose sum is σ = 668826905078. Its totient is φ = 668826905076.

The previous prime is 668826905029. The next prime is 668826905099. The reversal of 668826905077 is 770509628866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 572320997361 + 96505907716 = 756519^2 + 310654^2 .

It is a cyclic number.

It is not a de Polignac number, because 668826905077 - 2¹¹ = 668826903029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668826905027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334413452538 + 334413452539.

It is an arithmetic number, because the mean of its divisors is an integer number (334413452539).

Almost surely, 2^668826905077 is an apocalyptic number.

It is an amenable number.

668826905077 is a deficient number, since it is larger than the sum of its proper divisors (1).

668826905077 is an equidigital number, since it uses as much as digits as its factorization.

668826905077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60963840, while the sum is 64.

The spelling of 668826905077 in words is "six hundred sixty-eight billion, eight hundred twenty-six million, nine hundred five thousand, seventy-seven".