666823340 has 24 divisors (see below), whose sum is σ = 1401382080. Its totient is φ = 266528768.

The previous prime is 666823331. The next prime is 666823343. The reversal of 666823340 is 43328666.

It is a junction number, because it is equal to n+sod(n) for n = 666823294 and 666823303.

It is not an unprimeable number, because it can be changed into a prime (666823343) 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 7 ways as a sum of consecutive naturals, for example, 16349 + ... + 40011.

It is an arithmetic number, because the mean of its divisors is an integer number (58390920).

Almost surely, 2^666823340 is an apocalyptic number.

It is an amenable number.

666823340 is an abundant number, since it is smaller than the sum of its proper divisors (734558740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666823340 is a wasteful number, since it uses less digits than its factorization.

666823340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25081 (or 25079 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 38.

The square root of 666823340 is about 25822.9227625379. The cubic root of 666823340 is about 873.6488927578.

The spelling of 666823340 in words is "six hundred sixty-six million, eight hundred twenty-three thousand, three hundred forty".