15661001106 has 16 divisors (see below), whose sum is σ = 34802224800. Its totient is φ = 5220333684.

The previous prime is 15661001077. The next prime is 15661001143. The reversal of 15661001106 is 60110016651.

15661001106 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 15661001106.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145009216 + ... + 145009323.

It is an arithmetic number, because the mean of its divisors is an integer number (2175139050).

Almost surely, 2^15661001106 is an apocalyptic number.

15661001106 is an abundant number, since it is smaller than the sum of its proper divisors (19141223694).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15661001106 is a wasteful number, since it uses less digits than its factorization.

15661001106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290018550 (or 290018544 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

Adding to 15661001106 its reverse (60110016651), we get a palindrome (75771017757).

The spelling of 15661001106 in words is "fifteen billion, six hundred sixty-one million, one thousand, one hundred six".