855641966 has 4 divisors (see below), whose sum is σ = 1283462952. Its totient is φ = 427820982.

The previous prime is 855641957. The next prime is 855641971. The reversal of 855641966 is 669146558.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent 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 as a sum of consecutive naturals, namely, 213910490 + ... + 213910493.

It is an arithmetic number, because the mean of its divisors is an integer number (320865738).

Almost surely, 2^855641966 is an apocalyptic number.

855641966 is a deficient number, since it is larger than the sum of its proper divisors (427820986).

855641966 is a wasteful number, since it uses less digits than its factorization.

855641966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427820985.

The product of its digits is 1555200, while the sum is 50.

The square root of 855641966 is about 29251.3583616214. The cubic root of 855641966 is about 949.3594818141.

The spelling of 855641966 in words is "eight hundred fifty-five million, six hundred forty-one thousand, nine hundred sixty-six".