18103433401 has 9 divisors (see below), whose sum is σ = 18240760749. Its totient is φ = 17967135264.

The previous prime is 18103433363. The next prime is 18103433441. The reversal of 18103433401 is 10433430181.

The square root of 18103433401 is 134549.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 1560329001 + 16543104400 = 39501^2 + 128620^2 .

It is not a de Polignac number, because 18103433401 - 2¹³ = 18103425209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18103433401.

It is not an unprimeable number, because it can be changed into a prime (18103433441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 21123765 + ... + 21124621.

Almost surely, 2^18103433401 is an apocalyptic number.

18103433401 is the 134549-th square number.

18103433401 is the 67275-th centered octagonal number.

It is an amenable number.

18103433401 is a deficient number, since it is larger than the sum of its proper divisors (137327348).

18103433401 is an frugal number, since it uses more digits than its factorization.

18103433401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2028 (or 1014 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

Adding to 18103433401 its reverse (10433430181), we get a palindrome (28536863582).

The spelling of 18103433401 in words is "eighteen billion, one hundred three million, four hundred thirty-three thousand, four hundred one".