5661516204 has 18 divisors (see below), whose sum is σ = 14311054940. Its totient is φ = 1887172056.

The previous prime is 5661516191. The next prime is 5661516209. The reversal of 5661516204 is 4026151665.

5661516204 is a `hidden beast` number, since 5 + 6 + 615 + 16 + 20 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 157264339 = 5661516204 / (5 + 6 + 6 + 1 + 5 + 1 + 6 + 2 + 0 + 4).

It is not an unprimeable number, because it can be changed into a prime (5661516209) 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 5 ways as a sum of consecutive naturals, for example, 78632134 + ... + 78632205.

Almost surely, 2^5661516204 is an apocalyptic number.

It is an amenable number.

5661516204 is an abundant number, since it is smaller than the sum of its proper divisors (8649538736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

5661516204 is a wasteful number, since it uses less digits than its factorization.

5661516204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157264349 (or 157264344 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 5661516204 is about 75243.0475459361. The cubic root of 5661516204 is about 1782.2867764310.

Adding to 5661516204 its reverse (4026151665), we get a palindrome (9687667869).

The spelling of 5661516204 in words is "five billion, six hundred sixty-one million, five hundred sixteen thousand, two hundred four".