18105628643 has 4 divisors (see below), whose sum is σ = 19170665640. Its totient is φ = 17040591648.

The previous prime is 18105628603. The next prime is 18105628699. The reversal of 18105628643 is 34682650181.

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

It is not a de Polignac number, because 18105628643 - 2¹⁶ = 18105563107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18105628594 and 18105628603.

It is not an unprimeable number, because it can be changed into a prime (18105628603) 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, 532518473 + ... + 532518506.

It is an arithmetic number, because the mean of its divisors is an integer number (4792666410).

Almost surely, 2^18105628643 is an apocalyptic number.

18105628643 is a deficient number, since it is larger than the sum of its proper divisors (1065036997).

18105628643 is a wasteful number, since it uses less digits than its factorization.

18105628643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065036996.

The product of its (nonzero) digits is 276480, while the sum is 44.

The spelling of 18105628643 in words is "eighteen billion, one hundred five million, six hundred twenty-eight thousand, six hundred forty-three".