5511661111 has 16 divisors (see below), whose sum is σ = 6139699488. Its totient is φ = 4905792000.

The previous prime is 5511661093. The next prime is 5511661123. The reversal of 5511661111 is 1111661155.

It is a cyclic number.

It is not a de Polignac number, because 5511661111 - 2⁹ = 5511660599 is a prime.

It is a Duffinian number.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 5511661111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5511661411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84961 + ... + 135061.

It is an arithmetic number, because the mean of its divisors is an integer number (383731218).

Almost surely, 2^5511661111 is an apocalyptic number.

5511661111 is a deficient number, since it is larger than the sum of its proper divisors (628038377).

5511661111 is a wasteful number, since it uses less digits than its factorization.

5511661111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50322.

The product of its digits is 900, while the sum is 28.

The square root of 5511661111 is about 74240.5624372553. The cubic root of 5511661111 is about 1766.4207956435.

The spelling of 5511661111 in words is "five billion, five hundred eleven million, six hundred sixty-one thousand, one hundred eleven".