667138668368 has 10 divisors (see below), whose sum is σ = 1292581169994. Its totient is φ = 333569334176.

The previous prime is 667138668359. The next prime is 667138668389. The reversal of 667138668368 is 863866831766.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 533846499904 + 133292168464 = 730648^2 + 365092^2 .

It is a junction number, because it is equal to n+sod(n) for n = 667138668298 and 667138668307.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20848083371 + ... + 20848083402.

Almost surely, 2^667138668368 is an apocalyptic number.

It is an amenable number.

667138668368 is a deficient number, since it is larger than the sum of its proper divisors (625442501626).

667138668368 is a wasteful number, since it uses less digits than its factorization.

667138668368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41696166781 (or 41696166775 counting only the distinct ones).

The product of its digits is 250822656, while the sum is 68.

The spelling of 667138668368 in words is "six hundred sixty-seven billion, one hundred thirty-eight million, six hundred sixty-eight thousand, three hundred sixty-eight".