668961575 has 24 divisors (see below), whose sum is σ = 853070400. Its totient is φ = 520131200.

The previous prime is 668961571. The next prime is 668961583. The reversal of 668961575 is 575169866.

It is not a de Polignac number, because 668961575 - 2² = 668961571 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668961571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 173165 + ... + 176985.

It is an arithmetic number, because the mean of its divisors is an integer number (35544600).

Almost surely, 2^668961575 is an apocalyptic number.

668961575 is a deficient number, since it is larger than the sum of its proper divisors (184108825).

668961575 is a wasteful number, since it uses less digits than its factorization.

668961575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4027 (or 4022 counting only the distinct ones).

The product of its digits is 2721600, while the sum is 53.

The square root of 668961575 is about 25864.2915039249. The cubic root of 668961575 is about 874.5817102745.

The spelling of 668961575 in words is "six hundred sixty-eight million, nine hundred sixty-one thousand, five hundred seventy-five".