165520652223 has 4 divisors (see below), whose sum is σ = 220694202968. Its totient is φ = 110347101480.

The previous prime is 165520652189. The next prime is 165520652243. The reversal of 165520652223 is 322256025561.

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

It is not a de Polignac number, because 165520652223 - 2⁶ = 165520652159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165520652243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27586775368 + ... + 27586775373.

It is an arithmetic number, because the mean of its divisors is an integer number (55173550742).

Almost surely, 2^165520652223 is an apocalyptic number.

165520652223 is a deficient number, since it is larger than the sum of its proper divisors (55173550745).

165520652223 is an equidigital number, since it uses as much as digits as its factorization.

165520652223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55173550744.

The product of its (nonzero) digits is 216000, while the sum is 39.

Adding to 165520652223 its reverse (322256025561), we get a palindrome (487776677784).

The spelling of 165520652223 in words is "one hundred sixty-five billion, five hundred twenty million, six hundred fifty-two thousand, two hundred twenty-three".