438164382181851 has 24 divisors (see below), whose sum is σ = 717462146266320. Its totient is φ = 255448060865856.

The previous prime is 438164382181817. The next prime is 438164382181913. The reversal of 438164382181851 is 158181283461834.

438164382181851 is a `hidden beast` number, since 4 + 3 + 8 + 1 + 6 + 438 + 2 + 18 + 185 + 1 = 666.

It is not a de Polignac number, because 438164382181851 - 2¹⁰ = 438164382180827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (438164382181151) 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 23 ways as a sum of consecutive naturals, for example, 98552490396 + ... + 98552494841.

It is an arithmetic number, because the mean of its divisors is an integer number (29894256094430).

Almost surely, 2^{438164382181851} is an apocalyptic number.

438164382181851 is a deficient number, since it is larger than the sum of its proper divisors (279297764084469).

438164382181851 is a wasteful number, since it uses less digits than its factorization.

438164382181851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197104985275 (or 197104985272 counting only the distinct ones).

The product of its digits is 35389440, while the sum is 63.

The spelling of 438164382181851 in words is "four hundred thirty-eight trillion, one hundred sixty-four billion, three hundred eighty-two million, one hundred eighty-one thousand, eight hundred fifty-one".