668889669332 has 6 divisors (see below), whose sum is σ = 1170556921338. Its totient is φ = 334444834664.

The previous prime is 668889669323. The next prime is 668889669337. The reversal of 668889669332 is 233966988866.

It can be written as a sum of positive squares in only one way, i.e., 420313635856 + 248576033476 = 648316^2 + 498574^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 668889669332.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668889669337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83611208663 + ... + 83611208670.

It is an arithmetic number, because the mean of its divisors is an integer number (195092820223).

Almost surely, 2^668889669332 is an apocalyptic number.

It is an amenable number.

668889669332 is a deficient number, since it is larger than the sum of its proper divisors (501667252006).

668889669332 is a wasteful number, since it uses less digits than its factorization.

668889669332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167222417337 (or 167222417335 counting only the distinct ones).

The product of its digits is 967458816, while the sum is 74.

The spelling of 668889669332 in words is "six hundred sixty-eight billion, eight hundred eighty-nine million, six hundred sixty-nine thousand, three hundred thirty-two".