660066740 has 24 divisors (see below), whose sum is σ = 1386874440. Its totient is φ = 263886848.

The previous prime is 660066739. The next prime is 660066761. The reversal of 660066740 is 47660066.

It can be written as a sum of positive squares in 4 ways, for example, as 19166884 + 640899856 = 4378^2 + 25316^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 660066740.

It is a congruent number.

It is an unprimeable number.

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, 35396 + ... + 50724.

It is an arithmetic number, because the mean of its divisors is an integer number (57786435).

Almost surely, 2^660066740 is an apocalyptic number.

It is an amenable number.

660066740 is an abundant number, since it is smaller than the sum of its proper divisors (726807700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

660066740 is a wasteful number, since it uses less digits than its factorization.

660066740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17491 (or 17489 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 660066740 is about 25691.7640499830. The cubic root of 660066740 is about 870.6881154849.

The spelling of 660066740 in words is "six hundred sixty million, sixty-six thousand, seven hundred forty".