5166581561 has 4 divisors (see below), whose sum is σ = 5254150800. Its totient is φ = 5079012324.

The previous prime is 5166581533. The next prime is 5166581569. The reversal of 5166581561 is 1651856615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 5166581561 - 2¹⁰ = 5166580537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5166581569) 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, 43784531 + ... + 43784648.

It is an arithmetic number, because the mean of its divisors is an integer number (1313537700).

Almost surely, 2^5166581561 is an apocalyptic number.

It is an amenable number.

5166581561 is a deficient number, since it is larger than the sum of its proper divisors (87569239).

5166581561 is an equidigital number, since it uses as much as digits as its factorization.

5166581561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87569238.

The product of its digits is 216000, while the sum is 44.

The square root of 5166581561 is about 71878.9368382699. The cubic root of 5166581561 is about 1728.7589037000.

The spelling of 5166581561 in words is "five billion, one hundred sixty-six million, five hundred eighty-one thousand, five hundred sixty-one".