100444172165 has 4 divisors (see below), whose sum is σ = 120533006604. Its totient is φ = 80355337728.

The previous prime is 100444172161. The next prime is 100444172173. The reversal of 100444172165 is 561271444001.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19698403201 + 80745768964 = 140351^2 + 284158^2 .

It is a cyclic number.

It is not a de Polignac number, because 100444172165 - 2² = 100444172161 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 (100444172161) 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, 10044417212 + ... + 10044417221.

It is an arithmetic number, because the mean of its divisors is an integer number (30133251651).

Almost surely, 2^100444172165 is an apocalyptic number.

It is an amenable number.

100444172165 is a deficient number, since it is larger than the sum of its proper divisors (20088834439).

100444172165 is an equidigital number, since it uses as much as digits as its factorization.

100444172165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20088834438.

The product of its (nonzero) digits is 26880, while the sum is 35.

The spelling of 100444172165 in words is "one hundred billion, four hundred forty-four million, one hundred seventy-two thousand, one hundred sixty-five".