856909694255 has 8 divisors (see below), whose sum is σ = 1028306809152. Its totient is φ = 685517638048.

The previous prime is 856909694239. The next prime is 856909694261. The reversal of 856909694255 is 552496909658.

856909694255 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 856909694255 - 2⁴ = 856909694239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 881447 + ... + 1578216.

It is an arithmetic number, because the mean of its divisors is an integer number (128538351144).

Almost surely, 2^856909694255 is an apocalyptic number.

856909694255 is a deficient number, since it is larger than the sum of its proper divisors (171397114897).

856909694255 is a wasteful number, since it uses less digits than its factorization.

856909694255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2529345.

The product of its (nonzero) digits is 209952000, while the sum is 68.

The spelling of 856909694255 in words is "eight hundred fifty-six billion, nine hundred nine million, six hundred ninety-four thousand, two hundred fifty-five".