856663898 has 16 divisors (see below), whose sum is σ = 1363547520. Its totient is φ = 402257856.

The previous prime is 856663897. The next prime is 856663901. The reversal of 856663898 is 898366658.

It is not an unprimeable number, because it can be changed into a prime (856663897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11468 + ... + 42951.

It is an arithmetic number, because the mean of its divisors is an integer number (85221720).

Almost surely, 2^856663898 is an apocalyptic number.

856663898 is a deficient number, since it is larger than the sum of its proper divisors (506883622).

856663898 is a wasteful number, since it uses less digits than its factorization.

856663898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54901.

The product of its digits is 14929920, while the sum is 59.

The square root of 856663898 is about 29268.8212608571. The cubic root of 856663898 is about 949.7372858041.

The spelling of 856663898 in words is "eight hundred fifty-six million, six hundred sixty-three thousand, eight hundred ninety-eight".