668734148 has 6 divisors (see below), whose sum is σ = 1170284766. Its totient is φ = 334367072.

The previous prime is 668734111. The next prime is 668734181. The reversal of 668734148 is 841437866.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 663680644 + 5053504 = 25762^2 + 2248^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83591765 + ... + 83591772.

It is an arithmetic number, because the mean of its divisors is an integer number (195047461).

Almost surely, 2^668734148 is an apocalyptic number.

It is an amenable number.

668734148 is a deficient number, since it is larger than the sum of its proper divisors (501550618).

668734148 is a wasteful number, since it uses less digits than its factorization.

668734148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167183541 (or 167183539 counting only the distinct ones).

The product of its digits is 774144, while the sum is 47.

The square root of 668734148 is about 25859.8945860187. The cubic root of 668734148 is about 874.4825884680.

The spelling of 668734148 in words is "six hundred sixty-eight million, seven hundred thirty-four thousand, one hundred forty-eight".