856645158705 has 64 divisors (see below), whose sum is σ = 1606376859648. Its totient is φ = 381664120320.

The previous prime is 856645158703. The next prime is 856645158739. The reversal of 856645158705 is 507851546658.

856645158705 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 856645158705 - 2¹ = 856645158703 is a prime.

It is not an unprimeable number, because it can be changed into a prime (856645158701) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1855770 + ... + 2270940.

It is an arithmetic number, because the mean of its divisors is an integer number (25099638432).

Almost surely, 2^856645158705 is an apocalyptic number.

It is an amenable number.

856645158705 is a deficient number, since it is larger than the sum of its proper divisors (749731700943).

856645158705 is a wasteful number, since it uses less digits than its factorization.

856645158705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415686.

The product of its (nonzero) digits is 40320000, while the sum is 60.

The spelling of 856645158705 in words is "eight hundred fifty-six billion, six hundred forty-five million, one hundred fifty-eight thousand, seven hundred five".