668245455 has 24 divisors (see below), whose sum is σ = 1195658880. Its totient is φ = 344900160.

The previous prime is 668245453. The next prime is 668245477. The reversal of 668245455 is 554542866.

It is not a de Polignac number, because 668245455 - 2¹ = 668245453 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 668245455.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668245451) 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, 238120 + ... + 240909.

It is an arithmetic number, because the mean of its divisors is an integer number (49819120).

Almost surely, 2^668245455 is an apocalyptic number.

668245455 is a deficient number, since it is larger than the sum of its proper divisors (527413425).

668245455 is a wasteful number, since it uses less digits than its factorization.

668245455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479071 (or 479068 counting only the distinct ones).

The product of its digits is 1152000, while the sum is 45.

The square root of 668245455 is about 25850.4440000554. Note that the first 3 decimals coincide. The cubic root of 668245455 is about 874.2695204087.

The spelling of 668245455 in words is "six hundred sixty-eight million, two hundred forty-five thousand, four hundred fifty-five".