5661859873 has 4 divisors (see below), whose sum is σ = 5662011780. Its totient is φ = 5661707968.

The previous prime is 5661859823. The next prime is 5661859909. The reversal of 5661859873 is 3789581665.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2558032929 + 3103826944 = 50577^2 + 55712^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5661859873 is a prime.

It is a super-2 number, since 2×5661859873² = 64113314442975152258, which contains 22 as substring.

It is a Smith number, since the sum of its digits (58) 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 not an unprimeable number, because it can be changed into a prime (5661859823) 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, 22461 + ... + 108757.

It is an arithmetic number, because the mean of its divisors is an integer number (1415502945).

Almost surely, 2^5661859873 is an apocalyptic number.

It is an amenable number.

5661859873 is a deficient number, since it is larger than the sum of its proper divisors (151907).

5661859873 is an equidigital number, since it uses as much as digits as its factorization.

5661859873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151906.

The product of its digits is 10886400, while the sum is 58.

The square root of 5661859873 is about 75245.3312372269. The cubic root of 5661859873 is about 1782.3228388742.

The spelling of 5661859873 in words is "five billion, six hundred sixty-one million, eight hundred fifty-nine thousand, eight hundred seventy-three".