5661216407 has 16 divisors (see below), whose sum is σ = 7101457152. Its totient is φ = 4384264320.

The previous prime is 5661216391. The next prime is 5661216437. The reversal of 5661216407 is 7046121665.

It is a cyclic number.

It is not a de Polignac number, because 5661216407 - 2⁴ = 5661216391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5661216437) 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 15 ways as a sum of consecutive naturals, for example, 212978 + ... + 238079.

It is an arithmetic number, because the mean of its divisors is an integer number (443841072).

Almost surely, 2^5661216407 is an apocalyptic number.

5661216407 is a deficient number, since it is larger than the sum of its proper divisors (1440240745).

5661216407 is a wasteful number, since it uses less digits than its factorization.

5661216407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451238.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 5661216407 is about 75241.0553288562. The cubic root of 5661216407 is about 1782.2553164450.

The spelling of 5661216407 in words is "five billion, six hundred sixty-one million, two hundred sixteen thousand, four hundred seven".