165221510720200 has 96 divisors (see below), whose sum is σ = 421837076502720. Its totient is φ = 59682664800000.

The previous prime is 165221510720173. The next prime is 165221510720207. The reversal of 165221510720200 is 2027015122561.

It is not an unprimeable number, because it can be changed into a prime (165221510720207) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 248345571 + ... + 249009970.

It is an arithmetic number, because the mean of its divisors is an integer number (4394136213570).

Almost surely, 2^{165221510720200} is an apocalyptic number.

165221510720200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165221510720200 is an abundant number, since it is smaller than the sum of its proper divisors (256615565782520).

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

165221510720200 is a wasteful number, since it uses less digits than its factorization.

165221510720200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497355719 (or 497355710 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 34.

Adding to 165221510720200 its reverse (2027015122561), we get a palindrome (167248525842761).

The spelling of 165221510720200 in words is "one hundred sixty-five trillion, two hundred twenty-one billion, five hundred ten million, seven hundred twenty thousand, two hundred".