840646617601 has 16 divisors (see below), whose sum is σ = 966187008000. Its totient is φ = 716468906448.

The previous prime is 840646617589. The next prime is 840646617607. The reversal of 840646617601 is 106716646048.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 840646617601 - 2⁹ = 840646617089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840646617607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21656256 + ... + 21695038.

It is an arithmetic number, because the mean of its divisors is an integer number (60386688000).

Almost surely, 2^840646617601 is an apocalyptic number.

It is an amenable number.

840646617601 is a deficient number, since it is larger than the sum of its proper divisors (125540390399).

840646617601 is a wasteful number, since it uses less digits than its factorization.

840646617601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56268.

The product of its (nonzero) digits is 1161216, while the sum is 49.

The spelling of 840646617601 in words is "eight hundred forty billion, six hundred forty-six million, six hundred seventeen thousand, six hundred one".