5081554561 has 4 divisors (see below), whose sum is σ = 5153125824. Its totient is φ = 5009983300.

The previous prime is 5081554531. The next prime is 5081554613. The reversal of 5081554561 is 1654551805.

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 5081554561 - 2¹⁵ = 5081521793 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (5081554501) 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, 35785525 + ... + 35785666.

It is an arithmetic number, because the mean of its divisors is an integer number (1288281456).

Almost surely, 2^5081554561 is an apocalyptic number.

It is an amenable number.

5081554561 is a deficient number, since it is larger than the sum of its proper divisors (71571263).

5081554561 is an equidigital number, since it uses as much as digits as its factorization.

5081554561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71571262.

The product of its (nonzero) digits is 120000, while the sum is 40.

The square root of 5081554561 is about 71285.0233990282. The cubic root of 5081554561 is about 1719.2229409765. Note that the first 3 decimals are identical.

The spelling of 5081554561 in words is "five billion, eighty-one million, five hundred fifty-four thousand, five hundred sixty-one".