668011528 has 8 divisors (see below), whose sum is σ = 1252521630. Its totient is φ = 334005760.

The previous prime is 668011501. The next prime is 668011541. The reversal of 668011528 is 825110866.

It can be written as a sum of positive squares in only one way, i.e., 643231044 + 24780484 = 25362^2 + 4978^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41750713 + ... + 41750728.

Almost surely, 2^668011528 is an apocalyptic number.

It is an amenable number.

668011528 is a deficient number, since it is larger than the sum of its proper divisors (584510102).

668011528 is a wasteful number, since it uses less digits than its factorization.

668011528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83501447 (or 83501443 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 668011528 is about 25845.9189815336. The cubic root of 668011528 is about 874.1674924719.

The spelling of 668011528 in words is "six hundred sixty-eight million, eleven thousand, five hundred twenty-eight".