165617223020 has 24 divisors (see below), whose sum is σ = 347804573424. Its totient is φ = 66245288256.

The previous prime is 165617223011. The next prime is 165617223053. The reversal of 165617223020 is 20322716561.

165617223020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1098227 + ... + 1239893.

It is an arithmetic number, because the mean of its divisors is an integer number (14491857226).

Almost surely, 2^165617223020 is an apocalyptic number.

165617223020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165617223020 is an abundant number, since it is smaller than the sum of its proper divisors (182187350404).

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

165617223020 is a wasteful number, since it uses less digits than its factorization.

165617223020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200129 (or 200127 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 35.

Adding to 165617223020 its reverse (20322716561), we get a palindrome (185939939581).

The spelling of 165617223020 in words is "one hundred sixty-five billion, six hundred seventeen million, two hundred twenty-three thousand, twenty".