16655220101 has 4 divisors (see below), whose sum is σ = 17936390892. Its totient is φ = 15374049312.

The previous prime is 16655220097. The next prime is 16655220103. The reversal of 16655220101 is 10102255661.

It is a happy number.

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 5509350625 + 11145869476 = 74225^2 + 105574^2 .

It is a cyclic number.

It is not a de Polignac number, because 16655220101 - 2² = 16655220097 is a prime.

It is a super-2 number, since 2×16655220101² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16655220103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 640585376 + ... + 640585401.

It is an arithmetic number, because the mean of its divisors is an integer number (4484097723).

Almost surely, 2^16655220101 is an apocalyptic number.

It is an amenable number.

16655220101 is a deficient number, since it is larger than the sum of its proper divisors (1281170791).

16655220101 is a wasteful number, since it uses less digits than its factorization.

16655220101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1281170790.

The product of its (nonzero) digits is 3600, while the sum is 29.

Adding to 16655220101 its reverse (10102255661), we get a palindrome (26757475762).

The spelling of 16655220101 in words is "sixteen billion, six hundred fifty-five million, two hundred twenty thousand, one hundred one".