660798281025 has 27 divisors (see below), whose sum is σ = 1183584983529. Its totient is φ = 352419246720.

The previous prime is 660798280981. The next prime is 660798281047. The reversal of 660798281025 is 520182897066.

The square root of 660798281025 is 812895.

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

660798281025 is a `hidden beast` number, since 6 + 607 + 9 + 8 + 2 + 8 + 1 + 0 + 25 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 36401205681 + 624397075344 = 190791^2 + 790188^2 .

It is a de Polignac number, because none of the positive numbers 2^k-660798281025 is a prime.

It is an unprimeable number.

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 26 ways as a sum of consecutive naturals, for example, 12166329 + ... + 12220521.

Almost surely, 2^660798281025 is an apocalyptic number.

660798281025 is the 812895-th square number.

660798281025 is the 406448-th centered octagonal number.

It is an amenable number.

660798281025 is a deficient number, since it is larger than the sum of its proper divisors (522786702504).

660798281025 is an frugal number, since it uses more digits than its factorization.

660798281025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108402 (or 54201 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The spelling of 660798281025 in words is "six hundred sixty billion, seven hundred ninety-eight million, two hundred eighty-one thousand, twenty-five".