668814154 has 4 divisors (see below), whose sum is σ = 1003221234. Its totient is φ = 334407076.

The previous prime is 668814121. The next prime is 668814173. The reversal of 668814154 is 451418866.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 502790929 + 166023225 = 22423^2 + 12885^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 668814154.

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, 167203537 + ... + 167203540.

Almost surely, 2^668814154 is an apocalyptic number.

668814154 is a deficient number, since it is larger than the sum of its proper divisors (334407080).

668814154 is a wasteful number, since it uses less digits than its factorization.

668814154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334407079.

The product of its digits is 184320, while the sum is 43.

The square root of 668814154 is about 25861.4414524790. The cubic root of 668814154 is about 874.5174608530.

The spelling of 668814154 in words is "six hundred sixty-eight million, eight hundred fourteen thousand, one hundred fifty-four".