668055031845 has 32 divisors (see below), whose sum is σ = 1070415091200. Its totient is φ = 355787256384.

The previous prime is 668055031843. The next prime is 668055031867. The reversal of 668055031845 is 548130550866.

It is a happy number.

It is not a de Polignac number, because 668055031845 - 2¹ = 668055031843 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668055031843) 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 31 ways as a sum of consecutive naturals, for example, 68590986 + ... + 68600724.

It is an arithmetic number, because the mean of its divisors is an integer number (33450471600).

Almost surely, 2^668055031845 is an apocalyptic number.

It is an amenable number.

668055031845 is a deficient number, since it is larger than the sum of its proper divisors (402360059355).

668055031845 is a wasteful number, since it uses less digits than its factorization.

668055031845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15809.

The product of its (nonzero) digits is 3456000, while the sum is 51.

The spelling of 668055031845 in words is "six hundred sixty-eight billion, fifty-five million, thirty-one thousand, eight hundred forty-five".