660537243 has 24 divisors (see below), whose sum is σ = 987723776. Its totient is φ = 424926000.

The previous prime is 660537217. The next prime is 660537259. The reversal of 660537243 is 342735066.

660537243 is a `hidden beast` number, since 6 + 605 + 3 + 7 + 2 + 43 = 666.

It is not a de Polignac number, because 660537243 - 2⁶ = 660537179 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 660537198 and 660537207.

It is not an unprimeable number, because it can be changed into a prime (660537203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 99168 + ... + 105618.

Almost surely, 2^660537243 is an apocalyptic number.

660537243 is a deficient number, since it is larger than the sum of its proper divisors (327186533).

660537243 is a wasteful number, since it uses less digits than its factorization.

660537243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6855 (or 6852 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 36.

The square root of 660537243 is about 25700.9191080786. The cubic root of 660537243 is about 870.8949451114.

The spelling of 660537243 in words is "six hundred sixty million, five hundred thirty-seven thousand, two hundred forty-three".