165538609198980 has 192 divisors, whose sum is σ = 469011835256832. Its totient is φ = 43622314283520.

The previous prime is 165538609198973. The next prime is 165538609199009. The reversal of 165538609198980 is 89891906835561.

It is a super-2 number, since 2×165538609198980² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 165538609198896 and 165538609198905.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9327686467 + ... + 9327704213.

It is an arithmetic number, because the mean of its divisors is an integer number (2442769975296).

Almost surely, 2^{165538609198980} is an apocalyptic number.

165538609198980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165538609198980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (234505917628416).

165538609198980 is an abundant number, since it is smaller than the sum of its proper divisors (303473226057852).

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

165538609198980 is a wasteful number, since it uses less digits than its factorization.

165538609198980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22674 (or 22672 counting only the distinct ones).

The product of its (nonzero) digits is 1007769600, while the sum is 78.

The spelling of 165538609198980 in words is "one hundred sixty-five trillion, five hundred thirty-eight billion, six hundred nine million, one hundred ninety-eight thousand, nine hundred eighty".