165351220205011 has 4 divisors (see below), whose sum is σ = 165352789003392. Its totient is φ = 165349651406632.

The previous prime is 165351220204943. The next prime is 165351220205113. The reversal of 165351220205011 is 110502022153561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 165351220205011 - 2²³ = 165351211816403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165351220202011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 784241080 + ... + 784451893.

It is an arithmetic number, because the mean of its divisors is an integer number (41338197250848).

Almost surely, 2^{165351220205011} is an apocalyptic number.

165351220205011 is a deficient number, since it is larger than the sum of its proper divisors (1568798381).

165351220205011 is a wasteful number, since it uses less digits than its factorization.

165351220205011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1568798380.

The product of its (nonzero) digits is 18000, while the sum is 34.

Adding to 165351220205011 its reverse (110502022153561), we get a palindrome (275853242358572).

The spelling of 165351220205011 in words is "one hundred sixty-five trillion, three hundred fifty-one billion, two hundred twenty million, two hundred five thousand, eleven".