165638533104 has 120 divisors (see below), whose sum is σ = 513247542912. Its totient is φ = 49444306560.

The previous prime is 165638533063. The next prime is 165638533117. The reversal of 165638533104 is 401335836561.

165638533104 is a `hidden beast` number, since 1 + 6 + 5 + 6 + 3 + 8 + 533 + 104 = 666.

It is a super-2 number, since 2×165638533104² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 165638533104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 674244 + ... + 886499.

Almost surely, 2^165638533104 is an apocalyptic number.

It is an amenable number.

165638533104 is an abundant number, since it is smaller than the sum of its proper divisors (347609009808).

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

165638533104 is a wasteful number, since it uses less digits than its factorization.

165638533104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1560835 (or 1560826 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The spelling of 165638533104 in words is "one hundred sixty-five billion, six hundred thirty-eight million, five hundred thirty-three thousand, one hundred four".