165538698 has 64 divisors (see below), whose sum is σ = 370900992. Its totient is φ = 48911040.

The previous prime is 165538693. The next prime is 165538717. The reversal of 165538698 is 896835561.

It is a self number, because there is not a number n which added to its sum of digits gives 165538698.

It is not an unprimeable number, because it can be changed into a prime (165538693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 539061 + ... + 539367.

It is an arithmetic number, because the mean of its divisors is an integer number (5795328).

Almost surely, 2^165538698 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165538698, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (185450496).

165538698 is an abundant number, since it is smaller than the sum of its proper divisors (205362294).

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

165538698 is a wasteful number, since it uses less digits than its factorization.

165538698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579.

The product of its digits is 1555200, while the sum is 51.

The square root of 165538698 is about 12866.1842828400. The cubic root of 165538698 is about 549.0769066881.

The spelling of 165538698 in words is "one hundred sixty-five million, five hundred thirty-eight thousand, six hundred ninety-eight".