216625138884 has 144 divisors (see below), whose sum is σ = 705507331200. Its totient is φ = 56266246080.

The previous prime is 216625138823. The next prime is 216625138889. The reversal of 216625138884 is 488831526612.

216625138884 is a `hidden beast` number, since 2 + 1 + 6 + 6 + 251 + 388 + 8 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 216625138884.

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 47 ways as a sum of consecutive naturals, for example, 1092579 + ... + 1275530.

Almost surely, 2^216625138884 is an apocalyptic number.

It is an amenable number.

216625138884 is an abundant number, since it is smaller than the sum of its proper divisors (488882192316).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216625138884 is a wasteful number, since it uses less digits than its factorization.

216625138884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2368151 (or 2368132 counting only the distinct ones).

The product of its digits is 4423680, while the sum is 54.

The spelling of 216625138884 in words is "two hundred sixteen billion, six hundred twenty-five million, one hundred thirty-eight thousand, eight hundred eighty-four".