1668520552 has 16 divisors (see below), whose sum is σ = 3157179300. Its totient is φ = 826606080.

The previous prime is 1668520541. The next prime is 1668520559. The reversal of 1668520552 is 2550258661.

It can be written as a sum of positive squares in 2 ways, for example, as 1666762276 + 1758276 = 40826^2 + 1326^2 .

It is not an unprimeable number, because it can be changed into a prime (1668520559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 955849 + ... + 957592.

Almost surely, 2^1668520552 is an apocalyptic number.

It is an amenable number.

1668520552 is a deficient number, since it is larger than the sum of its proper divisors (1488658748).

1668520552 is a wasteful number, since it uses less digits than its factorization.

1668520552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1913556 (or 1913552 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 40.

The square root of 1668520552 is about 40847.5281014653. The cubic root of 1668520552 is about 1186.0705434239.

The spelling of 1668520552 in words is "one billion, six hundred sixty-eight million, five hundred twenty thousand, five hundred fifty-two".