840855956697 has 96 divisors (see below), whose sum is σ = 1333504972800. Its totient is φ = 528403087872.

The previous prime is 840855956693. The next prime is 840855956729. The reversal of 840855956697 is 796659558048.

840855956697 is a `hidden beast` number, since 8 + 4 + 0 + 8 + 5 + 59 + 566 + 9 + 7 = 666.

It is not a de Polignac number, because 840855956697 - 2² = 840855956693 is a prime.

It is not an unprimeable number, because it can be changed into a prime (840855956693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 203644329 + ... + 203648457.

It is an arithmetic number, because the mean of its divisors is an integer number (13890676800).

Almost surely, 2^840855956697 is an apocalyptic number.

It is an amenable number.

840855956697 is a deficient number, since it is larger than the sum of its proper divisors (492649016103).

840855956697 is a wasteful number, since it uses less digits than its factorization.

840855956697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4689 (or 4677 counting only the distinct ones).

The product of its (nonzero) digits is 653184000, while the sum is 72.

The spelling of 840855956697 in words is "eight hundred forty billion, eight hundred fifty-five million, nine hundred fifty-six thousand, six hundred ninety-seven".