668926411409 has 2 divisors, whose sum is σ = 668926411410. Its totient is φ = 668926411408.

The previous prime is 668926411393. The next prime is 668926411453. The reversal of 668926411409 is 904114629866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 363454648384 + 305471763025 = 602872^2 + 552695^2 .

It is a cyclic number.

It is not a de Polignac number, because 668926411409 - 2⁴ = 668926411393 is a prime.

It is not a weakly prime, because it can be changed into another prime (668926411459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334463205704 + 334463205705.

It is an arithmetic number, because the mean of its divisors is an integer number (334463205705).

Almost surely, 2^668926411409 is an apocalyptic number.

It is an amenable number.

668926411409 is a deficient number, since it is larger than the sum of its proper divisors (1).

668926411409 is an equidigital number, since it uses as much as digits as its factorization.

668926411409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4478976, while the sum is 56.

The spelling of 668926411409 in words is "six hundred sixty-eight billion, nine hundred twenty-six million, four hundred eleven thousand, four hundred nine".