855209668 has 6 divisors (see below), whose sum is σ = 1496616926. Its totient is φ = 427604832.

The previous prime is 855209659. The next prime is 855209689. The reversal of 855209668 is 866902558.

It can be written as a sum of positive squares in only one way, i.e., 663165504 + 192044164 = 25752^2 + 13858^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 106901205 + ... + 106901212.

Almost surely, 2^855209668 is an apocalyptic number.

It is an amenable number.

855209668 is a deficient number, since it is larger than the sum of its proper divisors (641407258).

855209668 is a wasteful number, since it uses less digits than its factorization.

855209668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213802421 (or 213802419 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 49.

The square root of 855209668 is about 29243.9680618072. The cubic root of 855209668 is about 949.1995725071.

The spelling of 855209668 in words is "eight hundred fifty-five million, two hundred nine thousand, six hundred sixty-eight".