660727747 has 4 divisors (see below), whose sum is σ = 660792280. Its totient is φ = 660663216.

The previous prime is 660727703. The next prime is 660727757. The reversal of 660727747 is 747727066.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660727747 is a prime.

It is a super-2 number, since 2×660727747² = 873122311311392018, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 660727697 and 660727706.

It is not an unprimeable number, because it can be changed into a prime (660727757) 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 3 ways as a sum of consecutive naturals, for example, 13122 + ... + 38647.

It is an arithmetic number, because the mean of its divisors is an integer number (165198070).

Almost surely, 2^660727747 is an apocalyptic number.

660727747 is a deficient number, since it is larger than the sum of its proper divisors (64533).

660727747 is a wasteful number, since it uses less digits than its factorization.

660727747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64532.

The product of its (nonzero) digits is 691488, while the sum is 46.

The square root of 660727747 is about 25704.6250118534. The cubic root of 660727747 is about 870.9786613212.

The spelling of 660727747 in words is "six hundred sixty million, seven hundred twenty-seven thousand, seven hundred forty-seven".