668546823 has 32 divisors (see below), whose sum is σ = 1050610176. Its totient is φ = 370251648.

The previous prime is 668546797. The next prime is 668546873. The reversal of 668546823 is 328645866.

It is not a de Polignac number, because 668546823 - 2¹² = 668542727 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668546873) 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 31 ways as a sum of consecutive naturals, for example, 88761 + ... + 95997.

It is an arithmetic number, because the mean of its divisors is an integer number (32831568).

Almost surely, 2^668546823 is an apocalyptic number.

668546823 is a deficient number, since it is larger than the sum of its proper divisors (382063353).

668546823 is a wasteful number, since it uses less digits than its factorization.

668546823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7383.

The product of its digits is 1658880, while the sum is 48.

The square root of 668546823 is about 25856.2724111578. The cubic root of 668546823 is about 874.4009278413.

The spelling of 668546823 in words is "six hundred sixty-eight million, five hundred forty-six thousand, eight hundred twenty-three".