100444521643 has 4 divisors (see below), whose sum is σ = 100446097048. Its totient is φ = 100442946240.

The previous prime is 100444521589. The next prime is 100444521689. The reversal of 100444521643 is 346125444001.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100444521643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100444521599 and 100444521608.

It is not an unprimeable number, because it can be changed into a prime (100444521143) 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, 687846 + ... + 820987.

It is an arithmetic number, because the mean of its divisors is an integer number (25111524262).

Almost surely, 2^100444521643 is an apocalyptic number.

100444521643 is a deficient number, since it is larger than the sum of its proper divisors (1575405).

100444521643 is an equidigital number, since it uses as much as digits as its factorization.

100444521643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1575404.

The product of its (nonzero) digits is 46080, while the sum is 34.

Adding to 100444521643 its reverse (346125444001), we get a palindrome (446569965644).

The spelling of 100444521643 in words is "one hundred billion, four hundred forty-four million, five hundred twenty-one thousand, six hundred forty-three".