5511661123 has 2 divisors, whose sum is σ = 5511661124. Its totient is φ = 5511661122.

The previous prime is 5511661093. The next prime is 5511661147. The reversal of 5511661123 is 3211661155.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 5511661123 - 2²¹ = 5509563971 is a prime.

It is a super-2 number, since 2×5511661123² = 60756816669579242258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (5511661423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2755830561 + 2755830562.

It is an arithmetic number, because the mean of its divisors is an integer number (2755830562).

Almost surely, 2^5511661123 is an apocalyptic number.

5511661123 is a deficient number, since it is larger than the sum of its proper divisors (1).

5511661123 is an equidigital number, since it uses as much as digits as its factorization.

5511661123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 31.

The square root of 5511661123 is about 74240.5625180736. The cubic root of 5511661123 is about 1766.4207969255.

The spelling of 5511661123 in words is "five billion, five hundred eleven million, six hundred sixty-one thousand, one hundred twenty-three".