1668520528 has 10 divisors (see below), whose sum is σ = 3232758554. Its totient is φ = 834260256.

The previous prime is 1668520523. The next prime is 1668520537. The reversal of 1668520528 is 8250258661.

It can be written as a sum of positive squares in only one way, i.e., 1396666384 + 271854144 = 37372^2 + 16488^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668520523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52141251 + ... + 52141282.

Almost surely, 2^1668520528 is an apocalyptic number.

It is an amenable number.

1668520528 is a deficient number, since it is larger than the sum of its proper divisors (1564238026).

1668520528 is a wasteful number, since it uses less digits than its factorization.

1668520528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104282541 (or 104282535 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 43.

The square root of 1668520528 is about 40847.5278076899. The cubic root of 1668520528 is about 1186.0705377371.

The spelling of 1668520528 in words is "one billion, six hundred sixty-eight million, five hundred twenty thousand, five hundred twenty-eight".