163332638406 has 80 divisors (see below), whose sum is σ = 419898083616. Its totient is φ = 46484803584.

The previous prime is 163332638389. The next prime is 163332638423. The reversal of 163332638406 is 604836233361.

163332638406 is a `hidden beast` number, since 1 + 6 + 3 + 3 + 3 + 2 + 638 + 4 + 0 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (163332638389) and next prime (163332638423).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 11220 + ... + 571656.

Almost surely, 2^163332638406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 163332638406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (209949041808).

163332638406 is an abundant number, since it is smaller than the sum of its proper divisors (256565445210).

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

163332638406 is a wasteful number, since it uses less digits than its factorization.

163332638406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560715 (or 560706 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 45.

The spelling of 163332638406 in words is "one hundred sixty-three billion, three hundred thirty-two million, six hundred thirty-eight thousand, four hundred six".