668875077 has 30 divisors (see below), whose sum is σ = 1077395858. Its totient is φ = 411098976.

The previous prime is 668875073. The next prime is 668875079. The reversal of 668875077 is 770578866.

It can be written as a sum of positive squares in 3 ways, for example, as 21986721 + 646888356 = 4689^2 + 25434^2 .

It is not a de Polignac number, because 668875077 - 2² = 668875073 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668875073) 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 in 29 ways as a sum of consecutive naturals, for example, 838843 + ... + 839639.

Almost surely, 2^668875077 is an apocalyptic number.

It is an amenable number.

668875077 is a deficient number, since it is larger than the sum of its proper divisors (408520781).

668875077 is an frugal number, since it uses more digits than its factorization.

668875077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1619 (or 813 counting only the distinct ones).

The product of its (nonzero) digits is 3951360, while the sum is 54.

The square root of 668875077 is about 25862.6192989032. The cubic root of 668875077 is about 874.5440136252.

The spelling of 668875077 in words is "six hundred sixty-eight million, eight hundred seventy-five thousand, seventy-seven".