5561945111 has 2 divisors, whose sum is σ = 5561945112. Its totient is φ = 5561945110.

The previous prime is 5561945099. The next prime is 5561945153. The reversal of 5561945111 is 1115491655.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5561945111 - 2³⁰ = 4488203287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5561945161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2780972555 + 2780972556.

It is an arithmetic number, because the mean of its divisors is an integer number (2780972556).

Almost surely, 2^5561945111 is an apocalyptic number.

5561945111 is a deficient number, since it is larger than the sum of its proper divisors (1).

5561945111 is an equidigital number, since it uses as much as digits as its factorization.

5561945111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27000, while the sum is 38.

The square root of 5561945111 is about 74578.4493737970. The cubic root of 5561945111 is about 1771.7763467479.

The spelling of 5561945111 in words is "five billion, five hundred sixty-one million, nine hundred forty-five thousand, one hundred eleven".