5120005216561 has 4 divisors (see below), whose sum is σ = 5131829709412. Its totient is φ = 5108180723712.

The previous prime is 5120005216549. The next prime is 5120005216619. The reversal of 5120005216561 is 1656125000215.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 235109584161 + 4884895632400 = 484881^2 + 2210180^2 .

It is a cyclic number.

It is not a de Polignac number, because 5120005216561 - 2²⁵ = 5119971662129 is a prime.

It is a super-2 number, since 2×5120005216561² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5120005216661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5912245776 + ... + 5912246641.

It is an arithmetic number, because the mean of its divisors is an integer number (1282957427353).

Almost surely, 2^{5120005216561} is an apocalyptic number.

It is an amenable number.

5120005216561 is a deficient number, since it is larger than the sum of its proper divisors (11824492851).

5120005216561 is a wasteful number, since it uses less digits than its factorization.

5120005216561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11824492850.

The product of its (nonzero) digits is 18000, while the sum is 34.

The spelling of 5120005216561 in words is "five trillion, one hundred twenty billion, five million, two hundred sixteen thousand, five hundred sixty-one".