165011101200 has 360 divisors, whose sum is σ = 657573552480. Its totient is φ = 37897113600.

The previous prime is 165011101193. The next prime is 165011101247. The reversal of 165011101200 is 2101110561.

It is a happy number.

165011101200 is a `hidden beast` number, since 1 + 650 + 1 + 1 + 1 + 0 + 12 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (360).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 642744 + ... + 862056.

Almost surely, 2^165011101200 is an apocalyptic number.

165011101200 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 165011101200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (328786776240).

165011101200 is an abundant number, since it is smaller than the sum of its proper divisors (492562451280).

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

165011101200 is a wasteful number, since it uses less digits than its factorization.

165011101200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219367 (or 219353 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 18.

Adding to 165011101200 its reverse (2101110561), we get a palindrome (167112211761).

The spelling of 165011101200 in words is "one hundred sixty-five billion, eleven million, one hundred one thousand, two hundred".