856814555 has 4 divisors (see below), whose sum is σ = 1028177472. Its totient is φ = 685451640.

The previous prime is 856814551. The next prime is 856814573. The reversal of 856814555 is 555418658.

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

It is not a de Polignac number, because 856814555 - 2² = 856814551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (856814551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85681451 + ... + 85681460.

It is an arithmetic number, because the mean of its divisors is an integer number (257044368).

Almost surely, 2^856814555 is an apocalyptic number.

856814555 is a deficient number, since it is larger than the sum of its proper divisors (171362917).

856814555 is a wasteful number, since it uses less digits than its factorization.

856814555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171362916.

The product of its digits is 960000, while the sum is 47.

The square root of 856814555 is about 29271.3948249823. The cubic root of 856814555 is about 949.7929576507.

The spelling of 856814555 in words is "eight hundred fifty-six million, eight hundred fourteen thousand, five hundred fifty-five".