856521550 has 12 divisors (see below), whose sum is σ = 1593130176. Its totient is φ = 342608600.

The previous prime is 856521521. The next prime is 856521563. The reversal of 856521550 is 55125658.

It is a super-2 number, since 2×856521550² = 1467258331228805000, which contains 22 as substring.

It is a congruent number.

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 in 5 ways as a sum of consecutive naturals, for example, 8565166 + ... + 8565265.

It is an arithmetic number, because the mean of its divisors is an integer number (132760848).

Almost surely, 2^856521550 is an apocalyptic number.

856521550 is a deficient number, since it is larger than the sum of its proper divisors (736608626).

856521550 is a wasteful number, since it uses less digits than its factorization.

856521550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17130443 (or 17130438 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 37.

The square root of 856521550 is about 29266.3894254143. The cubic root of 856521550 is about 949.6846783610.

The spelling of 856521550 in words is "eight hundred fifty-six million, five hundred twenty-one thousand, five hundred fifty".