660938193 has 12 divisors (see below), whose sum is σ = 955576180. Its totient is φ = 440215776.

The previous prime is 660938171. The next prime is 660938203. The reversal of 660938193 is 391839066.

660938193 is a `hidden beast` number, since 6 + 609 + 38 + 1 + 9 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 644753664 + 16184529 = 25392^2 + 4023^2 .

It is not a de Polignac number, because 660938193 - 2⁹ = 660937681 is a prime.

It is a super-2 number, since 2×660938193² = 873678589932210498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660938153) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23758 + ... + 43431.

Almost surely, 2^660938193 is an apocalyptic number.

It is an amenable number.

660938193 is a deficient number, since it is larger than the sum of its proper divisors (294637987).

660938193 is a wasteful number, since it uses less digits than its factorization.

660938193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68288 (or 68285 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The square root of 660938193 is about 25708.7182294256. The cubic root of 660938193 is about 871.0711222577.

The spelling of 660938193 in words is "six hundred sixty million, nine hundred thirty-eight thousand, one hundred ninety-three".