668887069 has 2 divisors, whose sum is σ = 668887070. Its totient is φ = 668887068.

The previous prime is 668887057. The next prime is 668887103. The reversal of 668887069 is 960788866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 492262969 + 176624100 = 22187^2 + 13290^2 .

It is a cyclic number.

It is not a de Polignac number, because 668887069 - 2⁷ = 668886941 is a prime.

It is a super-2 number, since 2×668887069² = 894819822150821522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668887469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334443534 + 334443535.

It is an arithmetic number, because the mean of its divisors is an integer number (334443535).

Almost surely, 2^668887069 is an apocalyptic number.

It is an amenable number.

668887069 is a deficient number, since it is larger than the sum of its proper divisors (1).

668887069 is an equidigital number, since it uses as much as digits as its factorization.

668887069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6967296, while the sum is 58.

The square root of 668887069 is about 25862.8511382639. The cubic root of 668887069 is about 874.5492400467.

The spelling of 668887069 in words is "six hundred sixty-eight million, eight hundred eighty-seven thousand, sixty-nine".