15511611066 has 64 divisors (see below), whose sum is σ = 36803358720. Its totient is φ = 4266452160.

The previous prime is 15511611043. The next prime is 15511611067. The reversal of 15511611066 is 66011611551.

15511611066 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×15511611066² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (15511611067) 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 31 ways as a sum of consecutive naturals, for example, 56005 + ... + 184823.

It is an arithmetic number, because the mean of its divisors is an integer number (575052480).

Almost surely, 2^15511611066 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15511611066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18401679360).

15511611066 is an abundant number, since it is smaller than the sum of its proper divisors (21291747654).

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

15511611066 is a wasteful number, since it uses less digits than its factorization.

15511611066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128939.

The product of its (nonzero) digits is 5400, while the sum is 33.

The spelling of 15511611066 in words is "fifteen billion, five hundred eleven million, six hundred eleven thousand, sixty-six".