163438739912 has 60 divisors (see below), whose sum is σ = 357623571105. Its totient is φ = 70021161504.

The previous prime is 163438739773. The next prime is 163438739941. The reversal of 163438739912 is 219937834361.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 87766432516 + 75672307396 = 296254^2 + 275086^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=285866.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 56028278 + ... + 56031194.

Almost surely, 2^163438739912 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 163438739912

163438739912 is an abundant number, since it is smaller than the sum of its proper divisors (194184831193).

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

163438739912 is an frugal number, since it uses more digits than its factorization.

163438739912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5868 (or 2926 counting only the distinct ones).

The product of its digits is 5878656, while the sum is 56.

The spelling of 163438739912 in words is "one hundred sixty-three billion, four hundred thirty-eight million, seven hundred thirty-nine thousand, nine hundred twelve".