5561161511 has 2 divisors, whose sum is σ = 5561161512. Its totient is φ = 5561161510.

The previous prime is 5561161493. The next prime is 5561161523. The reversal of 5561161511 is 1151611655.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 5561161511 - 2⁶ = 5561161447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5561161561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2780580755 + 2780580756.

It is an arithmetic number, because the mean of its divisors is an integer number (2780580756).

Almost surely, 2^5561161511 is an apocalyptic number.

5561161511 is a deficient number, since it is larger than the sum of its proper divisors (1).

5561161511 is an equidigital number, since it uses as much as digits as its factorization.

5561161511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4500, while the sum is 32.

The square root of 5561161511 is about 74573.1956603712. The cubic root of 5561161511 is about 1771.6931367004.

The spelling of 5561161511 in words is "five billion, five hundred sixty-one million, one hundred sixty-one thousand, five hundred eleven".