100123198165 has 4 divisors (see below), whose sum is σ = 120147837804. Its totient is φ = 80098558528.

The previous prime is 100123198157. The next prime is 100123198169. The reversal of 100123198165 is 561891321001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 561891321001 = 227 ⋅2475292163.

It can be written as a sum of positive squares in 2 ways, for example, as 32435289604 + 67687908561 = 180098^2 + 260169^2 .

It is a cyclic number.

It is not a de Polignac number, because 100123198165 - 2³ = 100123198157 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 (100123198169) 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, 10012319812 + ... + 10012319821.

It is an arithmetic number, because the mean of its divisors is an integer number (30036959451).

Almost surely, 2^100123198165 is an apocalyptic number.

It is an amenable number.

100123198165 is a deficient number, since it is larger than the sum of its proper divisors (20024639639).

100123198165 is an equidigital number, since it uses as much as digits as its factorization.

100123198165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20024639638.

The product of its (nonzero) digits is 12960, while the sum is 37.

The spelling of 100123198165 in words is "one hundred billion, one hundred twenty-three million, one hundred ninety-eight thousand, one hundred sixty-five".