16655440001 has 4 divisors (see below), whose sum is σ = 16656880452. Its totient is φ = 16653999552.

The previous prime is 16655439989. The next prime is 16655440007. The reversal of 16655440001 is 10004455661.

16655440001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10004455661 = 4789 ⋅2089049.

It can be written as a sum of positive squares in 2 ways, for example, as 12041770225 + 4613669776 = 109735^2 + 67924^2 .

It is a cyclic number.

It is not a de Polignac number, because 16655440001 - 2¹⁰ = 16655438977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16655440001.

It is not an unprimeable number, because it can be changed into a prime (16655440007) 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 3 ways as a sum of consecutive naturals, for example, 702740 + ... + 726053.

It is an arithmetic number, because the mean of its divisors is an integer number (4164220113).

Almost surely, 2^16655440001 is an apocalyptic number.

It is an amenable number.

16655440001 is a deficient number, since it is larger than the sum of its proper divisors (1440451).

16655440001 is a wasteful number, since it uses less digits than its factorization.

16655440001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1440450.

The product of its (nonzero) digits is 14400, while the sum is 32.

Adding to 16655440001 its reverse (10004455661), we get a palindrome (26659895662).

The spelling of 16655440001 in words is "sixteen billion, six hundred fifty-five million, four hundred forty thousand, one".