660068506 has 16 divisors (see below), whose sum is σ = 997806024. Its totient is φ = 327472704.

The previous prime is 660068501. The next prime is 660068509. The reversal of 660068506 is 605860066.

It can be written as a sum of positive squares in 4 ways, for example, as 308318481 + 351750025 = 17559^2 + 18755^2 .

It is a super-2 number, since 2×660068506² = 871380865226144072, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (660068501) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 380016 + ... + 381748.

Almost surely, 2^660068506 is an apocalyptic number.

660068506 is a deficient number, since it is larger than the sum of its proper divisors (337737518).

660068506 is a wasteful number, since it uses less digits than its factorization.

660068506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3105.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 660068506 is about 25691.7984189507. The cubic root of 660068506 is about 870.6888919891.

The spelling of 660068506 in words is "six hundred sixty million, sixty-eight thousand, five hundred six".