5811558161 has 4 divisors (see below), whose sum is σ = 5953303524. Its totient is φ = 5669812800.

The previous prime is 5811558157. The next prime is 5811558163. The reversal of 5811558161 is 1618551185.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1618551185 = 5 ⋅323710237.

It can be written as a sum of positive squares in 2 ways, for example, as 603193600 + 5208364561 = 24560^2 + 72169^2 .

It is a cyclic number.

It is not a de Polignac number, because 5811558161 - 2² = 5811558157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 141745321 = 5811558161 / (5 + 8 + 1 + 1 + 5 + 5 + 8 + 1 + 6 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5811558163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70872620 + ... + 70872701.

It is an arithmetic number, because the mean of its divisors is an integer number (1488325881).

Almost surely, 2^5811558161 is an apocalyptic number.

It is an amenable number.

5811558161 is a deficient number, since it is larger than the sum of its proper divisors (141745363).

5811558161 is a wasteful number, since it uses less digits than its factorization.

5811558161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141745362.

The product of its digits is 48000, while the sum is 41.

The square root of 5811558161 is about 76233.5763361526. The cubic root of 5811558161 is about 1797.8944681798.

The spelling of 5811558161 in words is "five billion, eight hundred eleven million, five hundred fifty-eight thousand, one hundred sixty-one".