655739985 has 24 divisors (see below), whose sum is σ = 1061297280. Its totient is φ = 345735808.

The previous prime is 655739971. The next prime is 655740037. The reversal of 655739985 is 589937556.

It is not a de Polignac number, because 655739985 - 2⁹ = 655739473 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 116056 + ... + 121574.

It is an arithmetic number, because the mean of its divisors is an integer number (44220720).

Almost surely, 2^655739985 is an apocalyptic number.

It is an amenable number.

655739985 is a deficient number, since it is larger than the sum of its proper divisors (405557295).

655739985 is an equidigital number, since it uses as much as digits as its factorization.

655739985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5705 (or 5616 counting only the distinct ones).

The product of its digits is 10206000, while the sum is 57.

The square root of 655739985 is about 25607.4205065641. The cubic root of 655739985 is about 868.7814821502.

The spelling of 655739985 in words is "six hundred fifty-five million, seven hundred thirty-nine thousand, nine hundred eighty-five".