840646636018161 has 48 divisors (see below), whose sum is σ = 1349020268683200. Its totient is φ = 463736444879232.

The previous prime is 840646636018139. The next prime is 840646636018169. The reversal of 840646636018161 is 161810636646048.

840646636018161 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 840646636018161 - 2⁵ = 840646636018129 is a prime.

It is a super-2 number, since 2×840646636018161² (a number of 31 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 840646636018095 and 840646636018104.

It is not an unprimeable number, because it can be changed into a prime (840646636018169) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14251635 + ... + 43409703.

It is an arithmetic number, because the mean of its divisors is an integer number (28104588930900).

Almost surely, 2^{840646636018161} is an apocalyptic number.

It is an amenable number.

840646636018161 is a deficient number, since it is larger than the sum of its proper divisors (508373632665039).

840646636018161 is a wasteful number, since it uses less digits than its factorization.

840646636018161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29164878 (or 29164871 counting only the distinct ones).

The product of its (nonzero) digits is 23887872, while the sum is 60.

The spelling of 840646636018161 in words is "eight hundred forty trillion, six hundred forty-six billion, six hundred thirty-six million, eighteen thousand, one hundred sixty-one".