668400146 has 8 divisors (see below), whose sum is σ = 1013865660. Its totient is φ = 330444928.

The previous prime is 668400137. The next prime is 668400151. The reversal of 668400146 is 641004866.

It can be written as a sum of positive squares in 2 ways, for example, as 612315025 + 56085121 = 24745^2 + 7489^2 .

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

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 in 3 ways as a sum of consecutive naturals, for example, 1877351 + ... + 1877706.

Almost surely, 2^668400146 is an apocalyptic number.

668400146 is a deficient number, since it is larger than the sum of its proper divisors (345465514).

668400146 is a wasteful number, since it uses less digits than its factorization.

668400146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3755148.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 668400146 is about 25853.4358645036. The cubic root of 668400146 is about 874.3369762570.

The spelling of 668400146 in words is "six hundred sixty-eight million, four hundred thousand, one hundred forty-six".