660759262641 has 45 divisors (see below), whose sum is σ = 994536684603. Its totient is φ = 437194538640.

The previous prime is 660759262609. The next prime is 660759262651. The reversal of 660759262641 is 146262957066.

The square root of 660759262641 is 812871.

It is a perfect power (a square), and thus also a powerful number.

660759262641 is a `hidden beast` number, since 6 + 6 + 0 + 7 + 5 + 9 + 2 + 626 + 4 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 7281038241 + 653478224400 = 85329^2 + 808380^2 .

It is not a de Polignac number, because 660759262641 - 2⁵ = 660759262609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (660759262601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 1324166610 + ... + 1324167108.

Almost surely, 2^660759262641 is an apocalyptic number.

660759262641 is the 812871-st square number.

660759262641 is the 406436-th centered octagonal number.

It is an amenable number.

660759262641 is a deficient number, since it is larger than the sum of its proper divisors (333777421962).

660759262641 is an frugal number, since it uses more digits than its factorization.

660759262641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1372 (or 683 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 54.

The spelling of 660759262641 in words is "six hundred sixty billion, seven hundred fifty-nine million, two hundred sixty-two thousand, six hundred forty-one".