656233985 has 8 divisors (see below), whose sum is σ = 859070016. Its totient is φ = 477261040.

The previous prime is 656233967. The next prime is 656233993. The reversal of 656233985 is 589332656.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 656233985 - 2⁸ = 656233729 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5965709 + ... + 5965818.

It is an arithmetic number, because the mean of its divisors is an integer number (107383752).

Almost surely, 2^656233985 is an apocalyptic number.

It is an amenable number.

656233985 is a deficient number, since it is larger than the sum of its proper divisors (202836031).

656233985 is a wasteful number, since it uses less digits than its factorization.

656233985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11931543.

The product of its digits is 1166400, while the sum is 47.

The square root of 656233985 is about 25617.0643321986. The cubic root of 656233985 is about 868.9995921398. Note that the first 3 decimals are identical.

The spelling of 656233985 in words is "six hundred fifty-six million, two hundred thirty-three thousand, nine hundred eighty-five".