5661446121 has 12 divisors (see below), whose sum is σ = 8186237748. Its totient is φ = 3770331264.

The previous prime is 5661446117. The next prime is 5661446129. The reversal of 5661446121 is 1216441665.

5661446121 is a `hidden beast` number, since 566 + 14 + 4 + 61 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4509794025 + 1151652096 = 67155^2 + 33936^2 .

It is not a de Polignac number, because 5661446121 - 2² = 5661446117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5661446129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 321460 + ... + 338613.

It is an arithmetic number, because the mean of its divisors is an integer number (682186479).

Almost surely, 2^5661446121 is an apocalyptic number.

It is an amenable number.

5661446121 is a deficient number, since it is larger than the sum of its proper divisors (2524791627).

5661446121 is a wasteful number, since it uses less digits than its factorization.

5661446121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661032 (or 661029 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 5661446121 is about 75242.5818336931. The cubic root of 5661446121 is about 1782.2794221867.

Adding to 5661446121 its reverse (1216441665), we get a palindrome (6877887786).

The spelling of 5661446121 in words is "five billion, six hundred sixty-one million, four hundred forty-six thousand, one hundred twenty-one".