165210210254123 has 4 divisors (see below), whose sum is σ = 169675351071840. Its totient is φ = 160745069436408.

The previous prime is 165210210254071. The next prime is 165210210254189. The reversal of 165210210254123 is 321452012012561.

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 165210210254123 - 2⁶ = 165210210254059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165210210250123) 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, 2232570408803 + ... + 2232570408876.

It is an arithmetic number, because the mean of its divisors is an integer number (42418837767960).

Almost surely, 2^{165210210254123} is an apocalyptic number.

165210210254123 is a deficient number, since it is larger than the sum of its proper divisors (4465140817717).

165210210254123 is an equidigital number, since it uses as much as digits as its factorization.

165210210254123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4465140817716.

The product of its (nonzero) digits is 28800, while the sum is 35.

Adding to 165210210254123 its reverse (321452012012561), we get a palindrome (486662222266684).

The spelling of 165210210254123 in words is "one hundred sixty-five trillion, two hundred ten billion, two hundred ten million, two hundred fifty-four thousand, one hundred twenty-three".