5511666661156 has 6 divisors (see below), whose sum is σ = 9645416657030. Its totient is φ = 2755833330576.

The previous prime is 5511666661139. The next prime is 5511666661159. The reversal of 5511666661156 is 6511666661155.

It can be written as a sum of positive squares in only one way, i.e., 4363018598656 + 1148648062500 = 2088784^2 + 1071750^2 .

It is a junction number, because it is equal to n+sod(n) for n = 5511666661097 and 5511666661106.

It is not an unprimeable number, because it can be changed into a prime (5511666661159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 688958332641 + ... + 688958332648.

Almost surely, 2^{5511666661156} is an apocalyptic number.

It is an amenable number.

5511666661156 is a deficient number, since it is larger than the sum of its proper divisors (4133749995874).

5511666661156 is a wasteful number, since it uses less digits than its factorization.

5511666661156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1377916665293 (or 1377916665291 counting only the distinct ones).

The product of its digits is 5832000, while the sum is 55.

Subtracting 5511666661156 from its reverse (6511666661155), we obtain a palindrome (999999999999).

The spelling of 5511666661156 in words is "five trillion, five hundred eleven billion, six hundred sixty-six million, six hundred sixty-one thousand, one hundred fifty-six".