668420845 has 8 divisors (see below), whose sum is σ = 802418400. Its totient is φ = 534527760.

The previous prime is 668420771. The next prime is 668420861. The reversal of 668420845 is 548024866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 668420845 - 2¹¹ = 668418797 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 11271 + ... + 38260.

It is an arithmetic number, because the mean of its divisors is an integer number (100302300).

Almost surely, 2^668420845 is an apocalyptic number.

It is an amenable number.

668420845 is a deficient number, since it is larger than the sum of its proper divisors (133997555).

668420845 is a wasteful number, since it uses less digits than its factorization.

668420845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52235.

The product of its (nonzero) digits is 368640, while the sum is 43.

The square root of 668420845 is about 25853.8361757013. The cubic root of 668420845 is about 874.3460016461.

The spelling of 668420845 in words is "six hundred sixty-eight million, four hundred twenty thousand, eight hundred forty-five".