216625138885 has 32 divisors (see below), whose sum is σ = 267214897152. Its totient is φ = 168530906880.

The previous prime is 216625138823. The next prime is 216625138889. The reversal of 216625138885 is 588831526612.

It is not a de Polignac number, because 216625138885 - 2²⁹ = 216088267973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216625138889) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11339812 + ... + 11358898.

It is an arithmetic number, because the mean of its divisors is an integer number (8350465536).

Almost surely, 2^216625138885 is an apocalyptic number.

It is an amenable number.

216625138885 is a deficient number, since it is larger than the sum of its proper divisors (50589758267).

216625138885 is a wasteful number, since it uses less digits than its factorization.

216625138885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19573.

The product of its digits is 5529600, while the sum is 55.

The spelling of 216625138885 in words is "two hundred sixteen billion, six hundred twenty-five million, one hundred thirty-eight thousand, eight hundred eighty-five".